How to Grow Legume Forage Mix (Alfalfa & Birdsfoot Trefoil)
Legume Forage Mix (Alfalfa & Birdsfoot Trefoil)
Medicago sativa & Lotus corniculatus
herbAlfalfa and birdsfoot trefoil are nitrogen-fixing legumes commonly grown together in mixed pasture and hay swards to improve soil fertility and provide high-protein forage for livestock. These deep-rooted perennials establish long-lived stands that reduce the need for synthetic fertilizers while improving soil structure and biodiversity.
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Example Legume Forage Mix (Alfalfa & Birdsfoot Trefoil) timeline · Pittsburgh, PA (Zone 6b)
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Plant Legume Forage Mix (Alfalfa & Birdsfoot Trefoil)
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Legume Forage Mix (Alfalfa & Birdsfoot Trefoil)
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Alfalfa thrives in zones 3-9; birdsfoot trefoil is hardy in zones 3-8. Best combined in zones 4-7 for balanced performance.
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Get my Legume Forage Mix (Alfalfa & Birdsfoot Trefoil) timeline →Growth Stages
Establishment (Seedling to Early Growth)
3-6 weeksSmall seedlings emerge with cotyledons and first true leaves; plants are delicate and vulnerable to competition and trampling
Keep weeds controlled; avoid grazing or cutting; ensure consistent moisture without waterlogging; monitor for damping-off diseases; apply inoculant at seeding if not already treated
Vegetative Development
4-8 weeksRapid leaf growth; alfalfa develops its characteristic trifoliate leaves and deep taproot; birdsfoot trefoil forms bushy growth with smaller pinnate leaves; nitrogen fixation begins actively
Light grazing or first cut when 6-8 inches tall may stimulate branching; avoid heavy use in first year; ensure nodule formation by observing root systems; maintain soil moisture moderate
Flowering & Bloom
2-4 weeks per cutAlfalfa produces purple or pink flower clusters; birdsfoot trefoil displays small yellow-orange flowers; forage quality peaks just before full bloom
Harvest at bud to early bloom stage for maximum nutritive value and protein; cutting at bloom extends stand longevity; allow some flowers to mature to maintain stand density; remove livestock before full bloom to prevent bloat risk in alfalfa
Pod Development & Regrowth
3-6 weeks per cycleSeeds develop in pods; if not harvested, plants become coarse; regrowth emerges from crown and roots for next cutting cycle
Cut before seed set to maintain forage quality; rest period of 3-4 weeks between cuts allows adequate regrowth and energy storage in roots; monitor for pest damage during regrowth; birdsfoot trefoil recovers quickly from cutting
Dormancy & Winter
3-4 months (varies by latitude)Plants die back above ground in cold climates; crowns and deep roots remain dormant; alfalfa is more winter-hardy than birdsfoot trefoil in northern zones
Do not cut below 2 inches in fall to protect crown; apply protective mulch in zone 3-4; avoid heavy fall grazing; snow cover provides insulation; ensure good drainage to prevent ice damage
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Cut forage at bud stage before larval damage peaks; early spring cutting removes overwintered eggs; parasitoid wasps provide biological control; avoid excessive fall cutting that weakens winter survival
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Monitor foliage; resistant alfalfa varieties available; early cutting can reduce populations; parasitoid wasps and coccinellid beetles provide natural control
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Limited economic impact in most regions; no specific control; rarely justifies intervention in pasture settings
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Tolerate light grazing pressure; heavy infestations managed by early cutting; pasture rotation reduces populations
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Ensure excellent drainage; avoid waterlogging; choose resistant varieties; rotate pastures every 3-4 years; remove severely affected areas
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Wet conditions favor disease; improve air circulation and drainage; cut infected areas early; resistant varieties available; typically minor in well-managed pastures
Uses
Livestock Forage & Hay
CulinaryAlfalfa and birdsfoot trefoil produce high-protein forage (15-25% crude protein) ideal for cattle, sheep, goats, and horses. Both can be grazed fresh or harvested as hay, with alfalfa being the premium hay crop for dairy cattle. [source]
Nutritional Supplements for Animals
MedicinalAlfalfa contains saponins, flavonoids, and chlorophyll with anti-inflammatory and antioxidant properties; historically used as a feed supplement to improve animal health and coat quality. Birdsfoot trefoil contains anti-methanogenic compounds that reduce ruminant methane emissions. [source]
Soil Improvement & Nitrogen Fixation
HouseholdBoth legumes fix atmospheric nitrogen through symbiotic relationships with Rhizobium bacteria, improving soil fertility for subsequent crops and reducing synthetic fertilizer inputs. Their deep roots improve soil structure and water infiltration. [source]
Sustainable Agricultural Practices
CraftMixed legume swards support regenerative farming, carbon sequestration, and biodiversity. Used in cover cropping, rotational grazing systems, and organic livestock operations to build soil health sustainably. [source]
Pollinator & Biodiversity Habitat
WildlifeAlfalfa and birdsfoot trefoil flowers support bees, butterflies, and other pollinators; the sward provides habitat for beneficial insects and soil organisms that enhance ecosystem health on pasture and hay land. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Cut or graze alfalfa and birdsfoot trefoil in mixed sward at boot to early bloom stage (6-10 inches tall) for optimal nutrition and plant longevity. First harvest 60-90 days after establishment; subsequent harvests every 30-40 days depending on growth rate and season. Allow 3-4 weeks between cuts for adequate regrowth and root energy storage. Avoid cutting below 2-3 inches to protect crowns. Birdsfoot trefoil regrows faster than alfalfa and may require separate management timing in some cases. Stop cutting in late summer (6-8 weeks before killing frost) to allow dormancy preparation. Hay harvest when alfalfa is at bud to early bloom with low moisture; birdsfoot trefoil cures quickly. Grazing can begin after plants are 4-5 inches if stand is vigorous; rotational grazing extends sward life.
Fun Facts
- 🌱 Alfalfa is known as the 'Father of All Forage Crops' and has been cultivated for over 2,000 years; it can live 20+ years in a productive stand and has roots reaching 15+ feet deep, accessing water and nutrients unavailable to shallow-rooted grasses.
- 🌱 Birdsfoot trefoil produces distinctive yellow flowers that cluster in umbel-like arrangements, with seedpods resembling a bird's foot—hence its common name. It is naturally less palatable than alfalfa, which can reduce bloat risk in livestock while still providing excellent nutrition.
- 🌱 A well-managed alfalfa-birdsfoot trefoil mixed sward can fix 100-150 lbs of nitrogen per acre annually, equivalent to the fertility provided by multiple tons of synthetic nitrogen fertilizer, making it one of agriculture's most efficient biological systems.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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