Licorice | Plants

Glycyrrhiza glabra • Also known as: Liquorice

Existing research highlights its potential utility in regenerative agriculture. Primarily, it demonstrates significant phytoremediation capabilities, as shown in experiments where it reduced soil pH and electrical conductivity in saline-alkaline soils, while also increasing soil organic matter and nitrate nitrogen levels. This suggests a role in soil building and remediation of degraded lands. Furthermore, *G. glabra* is adapted to arid, saline, and drought-prone environments, supported by symbiotic microbes that enhance its abiotic stress tolerance through nutrient acquisition and other mechanisms. This resilience positions it as a candidate for challenging agricultural sites. Although not explicitly mentioned with practices like rotational grazing or no-till, its soil improvement qualities align with the goals of such systems. Its medicinal properties are well-documented, but its direct application as a cover crop, forage, or nitrogen fixer within regenerative systems requires further investigation based on this knowledge base. While coverage in our knowledge base is limited, the above represents documented uses in regenerative systems.

For a full botanical description see: Plants For A Future(opens in new window) (external link)

Regenerative Quick Profile

All recommendations assume integrated, regenerative practices—not conventional inputs.

Climate & Soil Fit

Climate: Tropical Rainforest, Tropical Monsoon, Tropical Savanna, Hot Semi-Arid (Steppe), Cold Semi-Arid (Steppe), Hot Desert, Cold Desert, Humid Subtropical, Oceanic (Maritime Temperate), Hot-Summer Mediterranean, Warm-Summer Mediterranean, Monsoon-Influenced Humid Subtropical, Subtropical Highland, Hot-Summer Continental, Warm-Summer Continental, Subarctic, Monsoon-Influenced Hot-Summer Continental, Tundra

Zones: USDA 5-9, Australian Zones 3-8

Optimal Soil: Loam Soil

System Role & Functions

Primary: Soil Remediation

Secondary: Cash Crop With Services, Specialty

Key Benefits: Root System Depth

Management Level

Experience: Advanced

Maintenance: Moderate maintenance - This perennial thrives in fertile, well-drained soil and benefits from strategic water management; its maintenance focuses on integrating harvest with ongoing system health and managing its natural spread.

Value Streams

Diversifies farm income
Enhances biodiversity

Know the Debate

Soil improvement takes 3-5 years; initial establishment takes 2-3 years.
Nitrogen contribution gradual: 40-60 lbs/acre annually via root decomposition.
Deep roots physically break compaction over several years.
Tolerant of arid, saline soils; low water needs once established.

Regenerative Trait Ratings

How These Traits Are Calculated

Trait dimensions are ordered clockwise starting from the top of the chart (12 o'clock position):

1. System Value

Ecosystem service stacking across nitrogen, carbon, water, biodiversity

WHAT: Synthesizes the compounding value of multiple ecosystem services delivered simultaneously—nitrogen fixation, soil organic matter building, pollinator support, erosion control, and water infiltration improvement. This is the total regenerative impact beyond single-function metrics.

WHY: The highest-value cover crops deliver 3-5 significant ecosystem services at once. A legume that fixes nitrogen, builds biomass, supports pollinators, and improves water infiltration provides $150-300/acre in combined benefits versus $30-60 for single-function covers. This service stacking is the core principle of regenerative agriculture.

HOW: Scored via LLM synthesis of economics data, timeline benefits, and trait combinations. Exceptional (3.0): 4-5 major services stacked with strong economic value ratios. Typical (2.0): 2-3 moderate services. Limited (1.0): Single-function covers with minimal service stacking. Considers seed cost relative to benefit value.

2. Nitrogen Fixation

Biological nitrogen production via legume root nodule bacteria

WHAT: Measures the ability to convert atmospheric nitrogen (N₂) into plant-available ammonia through symbiotic bacteria in root nodules. Legumes form partnerships with rhizobium bacteria that fix 60-150 lbs N/acre/year, reducing or eliminating synthetic fertilizer needs for following crops.

WHY: Nitrogen is the most expensive fertilizer input in crop production ($0.50-1.00/lb). Cover crops with exceptional nitrogen fixation can provide $60-150/acre worth of fertility while building soil organic matter. This biological process also reduces groundwater contamination from nitrogen runoff and lowers farm carbon footprint.

HOW: Ratings based on annual nitrogen fixation capacity and reliability across soil conditions. Exceptional (3.0): Legumes like hairy vetch, crimson clover, and field peas fixing >100 lbs N/acre/year. Typical (2.0): Moderate fixers like red clover at 60-100 lbs N/acre/year. Limited (1.0): Non-legumes (grasses, brassicas) with zero fixation capacity.

3. Soil Building

Weighted: biomass production (60%) + root system depth (40%)

WHAT: Combines above-ground biomass production with root depth to measure total soil organic matter contribution. Biomass provides surface organic matter, while deep roots deposit carbon at depth and break up compaction layers.

WHY: Soil organic matter is the foundation of regenerative agriculture, improving water retention, nutrient cycling, and biological activity. Each 1% increase in soil organic matter holds an additional 20,000 gallons of water per acre and represents $500-1,000 in fertility value. Deep roots access subsoil nutrients and create channels for water infiltration.

HOW: Weighted formula prioritizes biomass production (60% weight) for immediate organic matter contribution, with root depth (40% weight) for long-term soil structure. Exceptional (3.0): High-biomass crops with deep roots like cereal rye (8+ tons biomass, 5+ ft roots). Typical (2.0): Moderate on both factors. Limited (1.0): Low biomass or shallow roots.

4. Weed Suppression

Physical competition through rapid establishment and dense growth

WHAT: Measures the ability to outcompete weeds through rapid germination, aggressive early growth, and dense canopy formation. Physical smothering and light competition reduce weed pressure without herbicides.

WHY: Weed management is a major labor and cost burden for farmers. Cover crops that effectively suppress weeds reduce herbicide costs ($20-60/acre), decrease cultivation passes (fuel + labor), and provide clean seedbeds for cash crops. This is especially valuable in organic systems where herbicide options are limited.

HOW: Ratings based on germination speed, tillering density, and canopy closure timing. Exceptional (3.0): Fast-establishing, dense-tillering crops like cereal rye, oilseed radish that close canopy within 3-4 weeks. Typical (2.0): Moderate establishment and coverage. Limited (1.0): Slow-establishing or sparse crops that allow weed competition.

5. Cold Hardiness

Winter survival for fall planting and spring green manure value

WHAT: Measures tolerance to freezing temperatures and ability to survive winter conditions. Winter-hardy cover crops can be fall-planted, overwinter as living mulch, and provide early spring growth before cash crop planting.

WHY: Fall-planted winter-hardy covers extend the growing season into unused months, capturing solar energy and preventing erosion during wet periods. Spring green manure from overwintered covers provides early nitrogen and biomass. This timing flexibility is critical in cold climates with short growing seasons.

HOW: Ratings based on minimum survival temperature and winter active growth. Exceptional (3.0): Winter-hardy crops like cereal rye, hairy vetch, crimson clover surviving to -20°F with active growth in spring. Typical (2.0): Moderate cold tolerance. Limited (1.0): Warm-season crops like buckwheat, cowpea killed by first frost.

6. Establishment Ease

Germination speed, soil requirement flexibility, planting window breadth

WHAT: Measures how easily the cover crop establishes from seed, including germination speed, tolerance for variable soil conditions, and flexibility in planting timing. Easy establishment means reliable stands without intensive management.

WHY: Difficult-to-establish covers increase risk of stand failure, wasted seed costs, and reduced benefits. Easy establishment crops tolerate late planting, poor seedbed preparation, and variable moisture—critical when cover cropping windows are narrow between cash crops. Reliable establishment ensures consistent soil building and weed suppression benefits.

HOW: Ratings based on days to emergence, soil condition sensitivity, and planting window breadth. Exceptional (3.0): Fast germinators like buckwheat (3-5 days) and cereal rye (5-7 days) with wide planting windows. Typical (2.0): Moderate establishment requirements. Limited (1.0): Slow or finicky establishers requiring precise conditions.

7. Adaptability

Weighted: climate tolerance (60%) + multi-benefit versatility (40%)

WHAT: Combines climate adaptability (temperature and rainfall range) with multi-benefit versatility (diverse ecosystem services) to measure overall system flexibility. High adaptability means the cover works across farm regions and provides multiple functions.

WHY: Farmers need cover crops that work reliably across diverse fields and provide stacked benefits. Climate-adaptable covers reduce risk in variable weather, while multi-benefit crops deliver nitrogen fixation + pollinator support + forage value simultaneously. This versatility maximizes return on cover crop investment.

HOW: Weighted formula prioritizes climate tolerance (60% weight) for geographic reliability, with multi-benefit value (40% weight) for functional stacking. Exceptional (3.0): Wide climate range + multiple significant benefits. Typical (2.0): Moderate on both factors. Limited (1.0): Narrow climate range or single-function crops.

8. Low Maintenance

Inverted from maintenance intensity—low inputs mean high scores

WHAT: Measures minimal input requirements for successful cover cropping. Low-maintenance covers require no irrigation, minimal fertility, easy termination, and tolerate variable management timing.

WHY: Cover crops compete for resources with cash crops in tight rotations. Low-maintenance covers fit easily into existing systems without adding labor, equipment, or input costs. Easy termination is especially critical—covers that are difficult to kill can become weeds and delay cash crop planting.

HOW: Inverted score from maintenance intensity trait (4.0 minus raw score). Exceptional (3.0): Self-sufficient crops like cereal rye, field peas requiring no irrigation or fertility, easily terminated by mowing or winter-kill. Typical (2.0): Moderate input needs. Limited (1.0): High-maintenance crops needing irrigation, heavy fertility, or difficult termination (herbicides, multiple tillage passes).

Ratings are based on documented performance in regenerative systems, not conventional high-input scenarios. All traits assume integrated management practices focused on soil health and ecosystem services.

Have a question about Licorice?

Climate Suitability Assessment

Will this plant thrive in your climate?

IDEALLY SUITED

Köppen Zone: Af (Tropical Rainforest), Am (Tropical Monsoon), Aw (Tropical Savanna), Cfa (Humid Subtropical), Cwa (Monsoon-Influenced Humid Subtropical)
USDA Zone: 6b, 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b, 11a, 11b, 12a, 12b, 13a, 13b
Australian Zone: temperate
EU Climate Region: atlantic

Licorice thrives in climates with a long growing season, typically 180-240 frost-free days, and moderate temperatures ranging from 60-75°F (15-24°C) during its active growth phase. These conditions are met in Köppen Cfa (with adequate moisture), Cfb, and Dfb zones, as well as USDA zones 7a-8b, Australian temperate zones, and EU Atlantic regions. Reliable spring establishment occurs when soil temperatures reach 50°F (10°C), leading to robust root development. Summer temperatures up to 85°F (29°C) are well-tolerated, promoting high glycyrrhizin content and excellent yields. Consistent annual rainfall of 30-50 inches (75-125 cm) is ideal, though it can tolerate drier periods with good soil moisture retention. Perennial survival is excellent, with stands persisting for 5-10 years or more, making it highly effective for long-term soil remediation and a reliable specialty cash crop with minimal management beyond harvesting. Establishment success rates are typically above 90%.

ADEQUATE

Köppen Zone: BSh (Hot Semi-Arid (Steppe)), BSk (Cold Semi-Arid (Steppe)), Cfb (Oceanic (Maritime Temperate)), Csa (Hot-Summer Mediterranean), Csb (Warm-Summer Mediterranean), Cwb (Subtropical Highland), Dfa (Hot-Summer Continental), Dfb (Warm-Summer Continental)
USDA Zone: 6a
Australian Zone: subtropical
EU Climate Region: continental

Licorice can perform adequately in climates with a growing season of 120-180 frost-free days and temperatures that are generally mild but may experience some extremes. This includes Köppen Cfa (with irrigation), Cfb, and Dfb zones, USDA zones 5b-6b, 9a-10b, Australian subtropical zones, and EU continental regions. While it can establish and grow, yields and glycyrrhizin content may be reduced by summer heat stress (above 85°F/29°C) in warmer zones, requiring supplemental irrigation (15-30 inches/38-75 cm annually) and careful water management. In cooler zones, shorter growing seasons and colder winters (below 0°F/-18°C) can lead to some winter kill and slower root development. Establishment success is good (70-85%) with proper timing. Stand persistence may be reduced to 3-5 years, and it requires standard management practices, including good drainage and occasional pest monitoring. It can still provide valuable soil remediation services and a moderate cash crop return.

NOT RECOMMENDED

Köppen Zone: ET (Tundra), BWh (Hot Desert), BWk (Cold Desert), Dfc (Subarctic), Dwa (Monsoon-Influenced Hot-Summer Continental)
USDA Zone: 2a, 3a, 3b, 4a, 5a, 5b

Licorice is not recommended for climates with extreme temperature fluctuations, very short growing seasons, or prolonged drought. This includes Köppen Csa, Csb, Dfa, Dwa, and Dwb zones, USDA zones 3a-5a, and any region with winter lows consistently below 0°F (-18°C) or summer highs regularly exceeding 95°F (35°C) without ample water. In hot, dry Mediterranean climates (Csa, Csb), summer drought and heat stress severely limit root development and glycyrrhizin production, requiring extensive irrigation that is economically unviable. In cold continental and subarctic climates (Dfa, Dwb, USDA 3a-5a), extreme winter cold causes near-certain winter kill, making perennial survival impossible and annual growth insufficient. Establishment success rates drop below 70%, and yields are highly variable and often poor. The intensive management and high risk of failure make it impractical for soil remediation or cash crop services in these zones. Alternative plants better adapted to these specific harsh conditions are strongly advised.

Better alternatives for these "not recommended" zones: Vetiver Grass (excellent for soil stabilization and water management, thrives in heat), Hairy Vetch (cold-hardy annual legume for nitrogen fixation in cold zones), Winter Rye (extremely cold-hardy cover crop for biomass and soil protection), Sainfoin (drought-tolerant legume for drier, milder climates)

Note: Zones listed above represent climates where this plant can produce reliably with reasonable management. Climate zones not mentioned would require intensive climate modification (greenhouses, extensive infrastructure) and are not economically viable for regenerative agriculture purposes.

Soil Suitability Assessment

Which soil types work best for this plant?

IDEALLY SUITED

Loam Soil

This plant thrives in these soil types without requiring amendments or remediation. Natural soil conditions support optimal growth and productivity.

ADEQUATE

Clay Soil, Rich Soil, Rocky Soil, Sandy Soil

This plant performs acceptably in these soil types with moderate, manageable remediation such as pH adjustment, compost addition, or drainage improvement. The required amendments are practical and cost-effective for regenerative agriculture.

NOT RECOMMENDED

Acidic Soil, Alkaline Soil, Desert Soil, Saline Soil, Wet Soil

Growing this plant in these soil types would require impractical remediation such as complete soil replacement, extensive amendments, or cost-prohibitive infrastructure. These conditions are not economically viable for regenerative agriculture.

Note: Soil suitability assessments focus on remediation requirements. "Ideally Suited" means the plant generally thrives without the need for substantial amendments, "Adequate" means manageable remediation (lime, compost, mulch), and "Not Recommended" means impractical soil changes would be required. Climate factors like rainfall and temperature also influence success.

Seasonal Considerations

Planting timing, growth duration, and harvest windows

Licorice, with its deep taproot and perennial nature, offers unique cover cropping opportunities. For spring planting, sow seeds or transplant seedlings after the danger of hard frost has passed and soil temperatures consistently reach around 50-60°F (10-15°C). Establishment can take several weeks, with significant root development occurring over the first year. In milder climates (Cfa, Cfb, Csa, Csb), it can overwinter effectively, entering dormancy and resuming growth vigorously in early spring.

Fall planting is generally not recommended for licorice as a cover crop, given its slow initial growth and long establishment period. It is best suited for longer-term cover crop rotations or as a component in perennial systems. Termination timing is critical. As a perennial, licorice requires careful management to prevent unwanted spread. Plan to terminate it well before planting your cash crop, potentially through repeated tillage or smother cropping in subsequent seasons. Peak biomass is typically achieved in mid-to-late summer in its second year of growth. Licorice is not typically used as a winter cover crop in colder zones (Dfa, Dfb, Dwa, Dwb) due to its sensitivity to freezing temperatures before substantial root reserves are built. Consider it for summer cover in warmer regions where its deep rooting can improve soil structure and suppress weeds.

System Role & Multi-Benefit Value

Functional roles, integration strategies, and stacked benefits

Functional Role

Total System Value

Licorice offers a multi-faceted contribution to whole-farm resilience, extending beyond its direct harvest value as a medicinal herb. Its primary system enhancement lies in soil remediation; studies show significant reduction in soil pH and electrical conductivity in saline-alkaline soils, alongside increases in organic matter and nitrate nitrogen. This improves the foundation for other crops and pastures. By enhancing soil microbial communities, licorice indirectly aids in nutrient acquisition and abiotic stress tolerance for neighboring plants. Ecosystem services include improved soil structure and potential for carbon sequestration in rehabilitated areas. Risk diversification is achieved by adding a high-value medicinal crop to the farm's portfolio, reducing reliance on monoculture commodity crops and providing an alternative income stream. Its ability to thrive in marginal conditions further enhances resilience by utilizing less productive land.

Integration Characteristics

Multi-Benefit Value: Adequate - Beyond its medicinal root value, licorice's deep taproot enhances soil structure and nutrient cycling, while offering subtle pollinator support and contributing to a more robust agroecosystem.

Management & Care Requirements

Integration guidance, maintenance needs, and care practices

How to Integrate This Plant

Licorice (Glycyrrhiza glabra) can be integrated into regenerative farm systems primarily for its soil remediation capabilities and its potential as a medicinal herb. Its role as a soil improver, particularly in saline-alkaline conditions, makes it valuable for restoring degraded land. It can be incorporated into systems aimed at improving soil health and fertility. While not a primary nitrogen fixer like some legumes, its association with beneficial microbes (endophytes, rhizobacteria, AM fungi) enhances nutrient acquisition and stress tolerance in plants, indirectly supporting overall system health. It is not typically used as a windbreak or for shade. Its value lies in improving soil conditions and providing a valuable medicinal crop. Early contributions focus on soil pH and electrical conductivity reduction (Year 1-2), with potential for increased organic matter and nitrogen over time. System value is stacked through soil health improvements, reduced reliance on chemical inputs, and the direct harvest of a high-value medicinal product, contributing to farm resilience and economic diversification.

Integration Practices & Management

Specifically, information regarding establishment methods such as seeding rates, timing, companion planting, or tillage practices is absent. Similarly, the knowledge base does not detail how farmers might integrate licorice with grazing livestock, including mob grazing, rotational systems, or specific timing and rest periods. Termination strategies, including natural winterkill, grazing down, crimping, mowing, or herbicide use, are also not discussed. Management considerations like fertility needs, competition management, and succession planning are not elaborated upon within these texts. Furthermore, the integration of licorice with cash crops through relay cropping, intercropping, or specific rotation sequences is not mentioned. The available sources primarily focus on the plant's phytoremediation capabilities in saline-alkaline soils, its association with beneficial microbial communities that enhance abiotic stress tolerance, and its therapeutic potential. While demonstrates its ability to reduce soil pH and electrical conductivity and increase organic matter, and highlights its symbiotic microbes' role in degraded soils, these texts do not provide practical guidance on its implementation in diverse regenerative farming operations. While coverage in our knowledge base is limited, the above represents documented uses in regenerative systems.

Management Profile

Maintenance Intensity: Adequate - This perennial thrives in fertile, well-drained soil and benefits from strategic water management; its maintenance focuses on integrating harvest with ongoing system health and managing its natural spread.

Sources behind this view

Research

Unveiling the adaptation mechanisms of symbiotic microbial communities in Glycyrrhiza glabra under extreme environmental conditions. (opens in new window)
This study found: Microbes associated with tough licorice plants help them survive drought, salt, and heat by improving nutrient uptake and stress defense. This knowledge can guide development of climate-resilient farm

Economics & Value Streams

Direct harvest, system benefits, ecosystem services, and risk diversification

Comprehensive economic analysis including direct harvest value, system enhancement contributions, ecosystem services, value timeline, and risk diversification strategies.

Cover Crop Investment

Metric	Value
Seed Cost	$50-150/acre $124-371/ha
Termination Cost	30-75 74-185
Biomass Production	2-5 4-11
N Fixation Value	N/A N/A
Weed Control Savings	20-60 49-148

Cover crops are soil investments, not cash crops. Economics measured in soil health gains, input reduction, and subsequent crop performance. Values show direct costs and estimated benefits.

System Enhancement Value

Beyond harvest: soil healing, contamination removal, and land restoration

Soil Remediation & Building

Licorice (Glycyrrhiza glabra) offers significant soil remediation capabilities, a vital service in degraded and marginal lands. Research indicates that two-year-old licorice plantations can notably reduce soil pH and electrical conductivity in saline-alkaline soils, transforming them into more arable conditions. Furthermore, it has been observed to increase soil organic matter content and nitrate nitrogen levels, creating a more nutrient-rich environment. The plant also positively influences soil microbial communities, shifting them towards greater diversity and a more beneficial composition (Ascomycota-rich). Associated symbiotic microbes, including endophytes and arbuscular mycorrhizal fungi, enhance licorice's own abiotic stress tolerance and contribute to soil health by improving nutrient acquisition and phytohormone production. This phytoremediation capacity makes licorice valuable for restoring soil health, increasing its resilience to environmental stresses, and potentially improving water infiltration and retention.

Nitrogen Fixation (if legume)

Estimated based on legume family: 30-100 lbs N/acre/year = $18-100/acre fertilizer replacement (assuming $0.60/lb N)

As a legume, licorice (Glycyrrhiza glabra) possesses the inherent capability for nitrogen fixation, a crucial service for enhancing soil fertility within integrated farm systems. While specific rates for licorice in various agricultural contexts are not detailed in the provided excerpts, its classification as a legume suggests it can contribute to the nitrogen cycle. This process enriches the soil with bioavailable nitrogen, reducing the need for synthetic nitrogen fertilizers, which are often energy-intensive to produce and can have negative environmental impacts. The symbiotic relationship with rhizobia bacteria allows licorice to convert atmospheric nitrogen into ammonia, which can then be utilized by the plant and subsequently released into the soil upon decomposition of plant material. This natural fertilization process supports the growth of companion crops and can lead to improved overall soil health, increased crop yields, and reduced input costs for farmers. The quantitative reference data indicates a typical legume nitrogen fixation range of 30-100 lbs N/acre/year, which translates to a significant economic value in terms of fertilizer replacement.

Ecosystem Service Contributions

Environmental contributions: carbon, pollinators, wildlife, and water

Carbon Sequestration: Licorice, as a perennial herbaceous plant with a deep root system, has the potential to sequester carbon in both above-ground biomass and, more significantly, in the soil through root exudates and decomposition. Its growth in marginal and arid conditions suggests a capacity for sustained biomass production over time, contributing to long-term soil carbon storage.
Pollinator Support: Low. While licorice does flower, there is no specific mention in the knowledge base of it being a significant pollinator attractant or provider of resources for pollinators.
Wildlife Habitat: Limited. The primary value for wildlife would likely be indirect, through the improvement of soil health and vegetation cover which could support soil invertebrates and potentially small ground-dwelling animals. No direct provision of mast, nesting, or significant browse is indicated.
Water Quality: Not applicable

Value Timeline: Soil Healing Process

When you'll see results: remediation timeline varies by contamination type

Years 1-2

Initial soil remediation benefits begin, including reduction in soil pH and electrical conductivity in saline-alkaline soils. Early improvements in soil organic matter and nitrate nitrogen levels are expected. The establishment of symbiotic microbial communities supporting soil health starts.

Years 3-5

Established licorice plants can begin to yield roots for harvest. Continued and potentially enhanced soil remediation and fertility improvements. Full nitrogen fixation potential is likely realized. Partial root harvesting may become feasible without killing the plant.

Years 10-20

Mature licorice plants will provide consistent root harvests. Significant and sustained soil health benefits, including robust soil organic matter, improved microbial diversity, and enhanced nutrient cycling. The plant's resilience in arid and saline conditions contributes to farm stability.

20+ Years

Long-term maintenance of soil health and fertility. Continued cash crop revenue from root harvests. The established root system may contribute to long-term soil structure improvement and erosion control.

Farm Risk Reduction

How this reduces farm risk: future land value and production potential

Multiple Revenue Streams: Cash crop revenue from licorice root sales (medicinal/specialty market). Soil remediation services contributing to improved yields of other crops. Reduced input costs through nitrogen fixation and enhanced soil fertility.
Temporal Income Spread: Value is generated annually through ongoing soil improvement services. Harvestable product (roots) can be obtained from year 3-5 onwards, with potential for partial harvesting to spread income and plant regeneration.
Market Risk Hedge: Diversifies farm revenue beyond traditional crops. Its adaptability to marginal and saline soils makes it resilient to drought and soil degradation, reducing risks associated with unfavorable environmental conditions. The specialty market for licorice roots can offer alternative revenue streams less susceptible to commodity market fluctuations.

Sources behind this view

Research

Unveiling the adaptation mechanisms of symbiotic microbial communities in Glycyrrhiza glabra under extreme environmental conditions. (opens in new window)
This study found: Microbes associated with tough licorice plants help them survive drought, salt, and heat by improving nutrient uptake and stress defense. This knowledge can guide development of climate-resilient farm

Regenerative Suitability Details

Comprehensive trait ratings for system integration assessment

Comparative ratings for this plant across key regenerative agriculture traits.

Trait	Suitability	Explanation
Cold Hardiness	Adequate	This deep-rooted perennial, hardy to Zone 4-5, provides winter soil protection and structure as it dies back and reliably regrows, contributing to ecosystem resilience.
Weed Suppression	Not Recommended	While its deep roots offer soil benefits, licorice's slower canopy closure and less dense growth habit make it less effective for aggressive weed suppression compared to faster-establishing cover crops.
Nitrogen Fixation	Adequate	As a legume, licorice contributes to soil fertility through moderate nitrogen fixation, enhancing the soil's nutrient cycling capabilities when appropriately inoculated.
Root System Depth	Ideally Suited	Its exceptionally deep taproot system, often exceeding 4 feet, actively breaks soil compaction and mines nutrients from deep subsoil, significantly enhancing soil structure and water infiltration.
Biomass Production	Not Recommended	While not a high biomass producer for immediate organic matter addition, its deep root system contributes to soil health and structure over time.
Establishment Ease	Not Recommended	Licorice requires patient establishment from seed due to slow germination and early vigor, benefiting from good soil conditions and moisture management for optimal integration.
Multi Benefit Value	Adequate	Beyond its medicinal root value, licorice's deep taproot enhances soil structure and nutrient cycling, while offering subtle pollinator support and contributing to a more robust agroecosystem.
Climate Adaptability	Adequate	Hardy in zones 4-9, licorice tolerates moderate heat and drought, with its deep root system enhancing moisture retention in well-drained soils, demonstrating resilience to varying conditions.
Maintenance Intensity	Adequate	This perennial thrives in fertile, well-drained soil and benefits from strategic water management; its maintenance focuses on integrating harvest with ongoing system health and managing its natural spread.

Comparative System: Ratings compare plants within their economic category (e.g., cover crop nitrogen fixation compared to other cover crops, not to all plants). Individual farm conditions and management practices significantly influence actual performance.

Know the Debate

Licorice offers unique soil-building potential, particularly in challenging climates. Its deep perennial root system excels in breaking compaction ...

Licorice offers unique soil-building potential, particularly in challenging climates. Its deep perennial root system excels in breaking compaction and improving water infiltration, especially in arid, saline, or drought-prone regions. While initial establishment takes 2-3 years, its long-term contribution to soil organic matter and nitrogen fertility through root decomposition provides gradual but significant benefits over a 3-5 year period. Its resilience to drought and saline soils makes it a valuable component for regenerative systems aiming for long-term soil health and reduced input reliance.

How long after planting is licorice effective for soil remediation?

3-5 years for full soil health benefits

Established licorice stands contribute significantly to soil health over 3-5 years by building organic matter and improving structure via deep roots.

Sources behind this view

Videos & Podcasts

Research

Building Soil Health and Fertility through Organic Amendments and Practices: A Review (opens in new window)
This study found: This review highlights how using natural organic materials and farming methods that build soil can restore soil health and fertility, which is crucial for sustainable farming and feeding the world. Intensive farming has damaged soils, but practices like adding animal manures, compost, cover crops, and crop residues, along with techniques such as no-till farming, diverse crop rotations, and integrating trees and livestock, can reverse this damage. These methods provide nutrients slowly, increase soil organic matter, and boost beneficial soil microbes. While it takes time to see the full benefits of rebuilding soil, these integrated approaches that reduce soil disturbance and keep the ground covered with living plants can significantly improve how well our agricultural systems function, leading to more resilient and productive farms.

2-3 years for initial establishment and performance

Licorice requires 2-3 years for optimal initial establishment and for its root system to become effective at breaking compaction and contributing nutrients.

Sources behind this view

Videos & Podcasts

Making Sense of the Differences

The timeline for licorice to exert its full soil health benefits varies by establishment method and climate. While root cuttings offer faster initial growth, seed establishment can take longer. Adequate moisture during the first year is crucial for reaching optimal performance within the 2-5 year range, requiring patience for gradual improvement.

What is the realistic nitrogen contribution of licorice?

40-60 lbs/acre annually through root decomposition

Licorice fixes 40-60 lbs of nitrogen per acre annually, which becomes available for subsequent crops as its deep roots decompose over time.

Sources behind this view

Videos & Podcasts

Making Sense of the Differences

While licorice fixes atmospheric nitrogen (40-60 lbs/acre), the amount available to subsequent crops depends on the timing of root decomposition. This contribution is gradual and indirect, primarily benefiting soil fertility over the long term rather than providing immediate nutrient credits like annual legumes.

How does licorice break up soil compaction?

Physical action of deep taproot

Licorice's extensive taproot system, reaching 6-15 feet, physically breaks up compacted soil layers, thereby improving water infiltration and aeration.

Sources behind this view

Research

Regenerative Agriculture: Restoring Ecosystems¢ Resilience and Productivity: A Review (opens in new window)
This study found: Regenerative agriculture is a farming approach that views farms as living ecosystems, moving away from the 'take-make-dispose' model of conventional farming. Instead of relying heavily on outside inputs, it focuses on building up the farm's natural resources and services. Key practices include disturbing the soil as little as possible (like no-till or reduced tillage), planting cover crops, rotating different crops, integrating livestock in a managed way, using compost, reducing synthetic fertilizers and pesticides, and incorporating trees. The approach is tailored to each farm's specific conditions. Farmers monitor soil health indicators like organic matter, how well soil holds water, and the amount of life in the soil. Studies show that regenerative practices can significantly increase soil organic matter (by 0.5-2% in 3-5 years), improve water infiltration (2-10 times better), boost soil microbial life (30-50% more), and increase beneficial insects (60-80% more). Farms can also capture 0.5 to 3 tons of carbon per hectare annually. Economically, these farms often have 20-40% lower input costs and can be more profitable in the long run, becoming more productive and stable over time.

Making Sense of the Differences

Licorice's mechanism for breaking compaction relies on its deep, persistent taproot. This physical action improves soil structure over time, contrasting with the immediate but often temporary effects of mechanical subsoiling. Farmers can expect long-term benefits as the root system matures and contributes to soil health.

Learn More

Why farmers use this plant and additional resources

Why Regenerative Farmers Use This Plant

Glycyrrhiza glabra, commonly known as licorice, offers significant regenerative benefits when integrated into agricultural systems, primarily through its deep root structure and nitrogen-fixing capabilities. As a legume, it plays a crucial role in improving soil fertility by fixing atmospheric nitrogen, with established stands capable of contributing an estimated 40-60 lbs of nitrogen per acre (45-67 kg/ha) annually to the soil. This nitrogen credit can substantially reduce the need for synthetic nitrogen fertilizers, potentially saving farmers $20-$40 per acre (approx. $50-$100/ha) depending on current fertilizer prices and the crop's nitrogen demand. Its extensive taproot system, which can reach depths of 6-15 feet (1.8-4.5 meters) or more, is exceptional at breaking up compacted soil layers, improving water infiltration, and enhancing aeration. This deep rooting also accesses nutrients from deeper soil profiles that may be inaccessible to shallower-rooted crops, making them available at the surface as the plant matter decomposes. Over a 3-5 year rotation, its persistent root system and nitrogen contributions build soil health and resilience, contributing significantly to soil organic matter accumulation over time and enhancing soil structure and water-holding capacity.

Beyond its direct soil-building contributions, licorice serves as a valuable component in diversified farming systems. Its dense growth habit provides excellent ground cover, suppressing weeds through competition and by creating a more robust soil ecosystem that favors beneficial soil microbes. In systems where it's managed as a perennial or a longer-term cover, it can provide habitat and forage for beneficial insects and pollinators, contributing to overall farm biodiversity. Its ability to thrive in drier conditions once established also makes it a resilient choice for regions facing increasing water scarcity, reducing reliance on irrigation for soil health maintenance. While not primarily a forage crop, its foliage can offer supplemental grazing in silvopasture systems, though its palatability and nutritional value for livestock are secondary to its soil improvement functions.

The quantitative ecosystem benefits of Glycyrrhiza glabra are tied to its perennial nature and deep root system. The extensive root network significantly improves soil structure, leading to enhanced water infiltration rates, which can reduce runoff by up to 30% in susceptible areas. This improved infiltration also increases soil's water-holding capacity, making farms more resilient to drought. The continuous addition of organic matter from decomposing root exudates and above-ground biomass, even if gradual, contributes to a steady increase in soil organic carbon over time. While specific data on pollinator visits is limited for this species, its flowering period can offer a niche resource for certain native bee species and other beneficial insects seeking late-season nectar and pollen, contributing to the farm's ecological web.

Regional success stories highlight licorice's adaptability. In the Mediterranean climates of southern Spain and Italy, it has been cultivated for centuries, often integrated into olive groves and vineyards where its deep roots help manage soil moisture and fertility. In Central Asia, particularly in Uzbekistan and Kazakhstan, it's a traditional crop grown in arid and semi-arid conditions, demonstrating its resilience and low water requirements once established. Australian farmers in drier wheat-sheep zones could explore its use as a perennial pasture component or in fallow systems to improve soil structure and fertility, particularly in areas with moderate winter rainfall. In the dryland farming regions of the southwestern United States, its drought tolerance and deep-rooting characteristics make it suitable for regenerative systems aiming to combat soil degradation and improve water management, and it can be integrated into permaculture designs or used in silvopasture systems. In Brazil's humid subtropical coffee and cocoa plantations, it could be used as a shade-tolerant, deep-rooted cover crop in the inter-rows. In the UK and Western Europe, it can be grown in rotation with arable crops, potentially interseeded into a spring cereal crop and allowed to overwinter for termination the following spring, or managed as a perennial in a dedicated plot.

Sources behind this view

Research

Unveiling the adaptation mechanisms of symbiotic microbial communities in Glycyrrhiza glabra under extreme environmental conditions. (opens in new window)
This study found: Microbes associated with tough licorice plants help them survive drought, salt, and heat by improving nutrient uptake and stress defense. This knowledge can guide development of climate-resilient farm
Influence of salt-tolerant medicinal herbs on soil geochemistry, nutrient cycling, and microbial communities in saline-alkali ecosystems of inner Mongolia. (opens in new window)
This study found: Planting licorice and sour jujube in salty-alkaline soils of Inner Mongolia for two years significantly improved soil health, reducing salt and pH, increasing organic matter and nutrients, and boostin

How to Integrate This Plant

Practical guidance for regenerative systems

Establishing Glycyrrhiza glabra typically involves sowing seeds or planting root cuttings. For seed propagation, seeding rates for broadcast sowing generally range from 20-40 lbs per acre (22-45 kg/ha). For drilled seed, rates can be slightly lower, around 15-30 lbs per acre (17-34 kg/ha). For direct seeding, rates of 10-20 lbs/acre (11-22 kg/ha) are also common. The optimal planting depth is shallow, about 0.25-0.5 inches (0.6-1.3 cm), to ensure good seed-to-soil contact and emergence. Spacing can vary depending on the intended use; for row cultivation, rows are typically spaced 2-3 feet (0.6-0.9 meters) apart, with plants spaced 12-18 inches (30-45 cm) within the row for a dense cover crop, or wider spacing of 3-4 feet (0.9-1.2 m) might be employed for perennial cultivation to allow for plant expansion.

In the Northern Hemisphere, the ideal sowing window is typically late spring to early summer, from April to June, after the risk of frost has passed and soil temperatures are warming. In the Southern Hemisphere, this translates to October to December. Sowing is best done in early spring, from March to May, once the risk of hard frost has passed. Adequate moisture is crucial during establishment, with approximately 1 inch (2.5 cm) of water per week, ideally from rainfall or irrigation, needed for optimal germination and early growth. Root cuttings offer a faster establishment and more uniform stand, with planting density adjusted based on desired coverage and management goals.

Once established, Glycyrrhiza glabra is relatively drought-tolerant due to its deep taproot, but it performs best with consistent moisture, especially during the first year. Mature plants are highly drought-tolerant. Fertility management should prioritize biological approaches; as a legume, it fixes its own nitrogen, requiring minimal external nitrogen. Incorporating compost or aged manure during site preparation can provide essential phosphorus, potassium, and micronutrients. While it can tolerate a wide range of soil pH, it prefers neutral to slightly alkaline conditions. Growth is steady, with plants reaching a mature height of 3-5 feet (0.9-1.5 meters) within 2-3 years. Pest and disease management should focus on promoting plant health through good soil biology and appropriate spacing to ensure air circulation, minimizing the need for chemical interventions. Healthy soil and a diverse ecosystem will naturally suppress most issues.

Termination and residue management for Glycyrrhiza glabra are approached differently than for annual cover crops, as it is often managed as a perennial or semi-perennial crop for its roots or as a long-term soil builder. Due to its perennial nature, complete termination for a subsequent annual cash crop is often challenging and may require multiple interventions or a shift in farming system. Natural winterkill is unlikely to be effective for established plants in most climates where it is grown. Grazing or mowing can be used to reduce biomass and stress the plant, but will not typically kill it. Crimping/roller-crimping is generally ineffective for terminating established perennial legumes. If termination is desired for crop rotation, it is best achieved through mechanical means, such as repeated tillage or cultivation, especially after several years of growth, or digging. For regenerative systems aiming to maximize its soil-building benefits, allowing it to persist for 3-5 years or longer is ideal. If used as a cover crop in a rotation, it would typically be terminated in the spring before planting a summer cash crop, allowing its substantial biomass to decompose over 60-90 days, releasing its fixed nitrogen gradually. For example, if terminated in April, the residue would be breaking down, and its nitrogen would become available for a May or June planting. If it's a perennial system, harvesting the roots is the primary form of "termination" and utilization, leaving the above-ground biomass to decompose and contribute to soil organic matter. Seed management is critical if volunteer establishment is not desired; seed heads should be removed before maturity if reseeding is a concern.

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