How to Grow Forage Legumes

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Forage Legumes

Fabaceae (family); common genera include Medicago, Trifolium, Lespedeza

herb

Forage legumes are nitrogen-fixing plants grown primarily as livestock feed and cover crops. They include clovers, alfalfa, vetches, and other members of the Fabaceae family that improve soil fertility while providing high-protein forage. These plants are essential for sustainable agriculture and rotational grazing systems.

Looking for a specific variety?

Alfalfa Red Clover White Clover Birdsfoot Trefoil Hairy Vetch Sainfoin

When should you plant Forage Legumes in your zone?

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Example Forage Legumes timeline · Pittsburgh, PA (Zone 6b)

Plant Forage Legumes
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Forage Legumes
Around Jun 16

≈ 60 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Forage Legumes dates for your own zip code.

Growing Conditions

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Sun: Full sun, 6-8 hours minimum daily

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Water: Moderate; once established, most forage legumes are drought-tolerant. Provide 1-2 inches of water weekly during establishment and dry periods. Avoid waterlogging.

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Spacing: 4-12 inches (varies by species and seeding method; broadcast seeding or drill seeding at 15-30 lbs/acre) inches

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Days to maturity: 60-120 days to first grazing or cutting (varies widely by species and intended use)

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Planting depth: 0.25-0.5 inches for small-seeded species; 0.5-1 inch for larger seeds

Soil

Type: Well-draining loamy to clay loam soil

pH: 6.0-7.5

Amendments:

Lime (to raise pH if acidic) Phosphorus Potassium Avoid excessive nitrogen (legumes fix their own)

Growing Zones

Find your zone →

Varies by species; most thrive in zones 3-8, with some cold-hardy varieties in zones 2-9

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b

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Growth Stages

Germination & Seedling

2-4 weeks

Seeds germinate within 7-14 days under moist conditions. Seedlings develop cotyledons and first true leaves. Root systems begin establishing.

Keep soil consistently moist but not waterlogged. Protect from foot traffic and heavy grazing. Ensure good seed-to-soil contact by rolling or pressing fields.

Vegetative Growth

4-8 weeks

Plant develops dense foliage and deep root systems. Nodules form on roots where nitrogen-fixing bacteria establish symbiotic relationships. Stems remain soft and palatable.

Monitor for weeds and suppress with light cultivation or early grazing. Ensure adequate soil moisture. Do not allow to go to seed if maximum forage quality is desired.

Flowering & Seed Formation

3-6 weeks

Flower buds and blooms appear. Plant diverts energy to seed production; forage quality decreases as fiber content increases. Nutritional value peaks at late bud to early flower stage.

Harvest for maximum nutrition just before or at early flowering. If maintaining stand for perennial use, allow some seed maturation. Avoid overgrazing to allow plant recovery.

Seed Maturation & Dormancy

2-4 weeks

Seeds fully mature and harden. Plants may go dormant or regrow depending on species and environmental conditions. Nutritional value is lowest at full maturity.

For seed harvest, allow full maturation. For forage, cut before this stage. Perennial varieties will regrow from crowns if managed properly.

Regrowth & Persistence

Ongoing throughout season

After cutting or grazing, plants regrow from crowns and roots. Multiple harvests are possible in a season with proper management. Perennial stands can remain productive for 3-7+ years.

Remove only 50-60% of foliage to ensure regrowth. Allow 3-4 weeks between grazing rotations. Reseed gaps if stand thins. Monitor for disease and pests.

Companion Planting

Plan your garden →

Plant with:

Timothy grass Orchard grass Perennial ryegrass Tall fescue Brassicas (for nitrogen fixing)

Avoid planting near:

Allelopathic plants like black walnut Tall annual grasses that shade seedlings Areas with saline or waterlogged soils

Common Pests

Early spring cutting, beneficial parasitic wasps, insecticidal soaps, avoid late fall cutting that weakens plants
Timely hay harvest, resistant varieties, natural enemies, moderate grazing to reduce plant stress
Border strips of tall vegetation, insecticidal soaps, avoid over-fertilization, remove from areas before flowering
Conserve predators (birds, parasitic wasps), avoid bare ground margins, early cutting to reduce habitat
Use resistant varieties, avoid wet conditions, proper drainage, remove affected plants, rotate crops
Plant resistant varieties, crop rotation (3+ years away), avoid waterlogging, disinfect equipment

Uses

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Livestock Feed & Pasture

Culinary

Forage legumes are high in protein (15-25% crude protein) and provide excellent nutrition for cattle, sheep, horses, and other livestock as fresh pasture, hay, or silage. They are more nutrient-dense than grasses alone. [source]

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Nitrogen Fixation & Soil Improvement

Agricultural

Legumes form symbiotic relationships with Rhizobium bacteria that fix atmospheric nitrogen, enriching soil and reducing the need for synthetic nitrogen fertilizers. Legume residues improve soil organic matter when plowed down. [source]

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Cover Cropping & Erosion Control

Household

Forage legumes stabilize soil, prevent erosion, suppress weeds, and break disease and pest cycles in rotation systems. Winter-hardy varieties protect bare ground during off-season. [source]

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Herbal & Nutritional Supplements

Medicinal

Alfalfa is used in herbal medicine and as a nutritional supplement for humans, rich in vitamins, minerals, and isoflavones. Red clover has been traditionally used in herbal wellness preparations. [source]

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Pollinator & Wildlife Habitat

Wildlife

Legume flowers attract bees, butterflies, and other pollinators. These plants provide food and shelter for numerous beneficial insects and wildlife species, supporting biodiversity. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

For maximum protein and palatability, harvest at late bud to early flowering stage (usually 4-8 weeks after planting/regrowth). Cut or graze to 3-4 inches height for perennial stands to allow regrowth. For hay, dry to 15-20% moisture before baling. For pasture, rotate grazing to prevent overuse. Each stand can provide 2-4 cuttings per season depending on climate and species. Seed crops should be harvested when pods turn brown and seeds rattle in pods.

Fun Facts

🌱 A single alfalfa plant can have roots extending 20+ feet deep, making it incredibly drought-tolerant and excellent for breaking up compacted soil layers.
🌱 Legumes can fix 100-300 pounds of nitrogen per acre per year through their symbiotic relationship with Rhizobium bacteria, reducing fertilizer needs and saving farmers significant money.
🌱 Clover species are called 'volunteers' in agriculture because they often establish themselves naturally in pastures and fields, and a single clover plant can spread via stolons to cover several square feet.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Cover Crop Crown Full Sun Perennial True Leaves

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