How to Grow Vernal Alfalfa
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Vernal Alfalfa
Medicago sativa 'Vernal'
herbVernal is a cold-hardy variety of alfalfa, a nitrogen-fixing legume widely cultivated as a forage crop for livestock. It is an herbaceous perennial that grows in dense clumps and can be harvested multiple times per season. Vernal is particularly valued in northern climates for its winter hardiness and reliable yields.
When should you plant Vernal Alfalfa in your zone?
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Example Vernal Alfalfa timeline · Pittsburgh, PA (Zone 6b)
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Plant Vernal Alfalfa
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 Vernal Alfalfa
Around Jun 6≈ 50 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Vernal Alfalfa dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-8, with exceptional cold hardiness making it ideal for northern regions
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Germination & Seedling
2-3 weeksSeeds germinate in 5-10 days with warm soil. Seedlings develop the first true leaves and establish a small root system.
Ensure adequate soil moisture for germination. Keep seedbed firm and free of competing weeds. Avoid disturbing young seedlings.
Early Vegetative Growth
3-4 weeksPlant develops multiple stems from crown and expands leaf area. Rapid growth begins as root system deepens.
Provide consistent moisture and light. Control weeds aggressively to reduce competition. No nitrogen fertilizer needed.
Bud to Bloom
2-3 weeksFlower buds form in racemes at stem tips. Plants reach 24-36 inches height at early bloom stage.
This is the optimal harvest window for forage quality. Cut before full bloom for maximum nutritional value and palatability.
Flowering
1-2 weeksPurple, pink, or blue flowers bloom along stems. Plant reaches maximum height and biomass.
If harvesting for seed, allow flowers to mature. For forage, cut before seed set to encourage regrowth.
Post-Harvest Regrowth
4-6 weeks between harvestsPlant rapidly regrows from crown after cutting. New shoots emerge from buds at the base.
Leave 2-3 inches of stubble to support regrowth. Water adequately after harvest. Vernal can produce 2-4 harvests per season depending on climate.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Scout early spring; harvest early to disrupt life cycle; predatory insects; insecticidal sprays if threshold exceeded
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Encourage beneficial insects; spray with neem oil or insecticidal soap; harvest regularly
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Remove infested leaves; early harvest; resistant varieties
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Monitor for larvae; early cutting; biological controls; insecticidal sprays if severe
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Early harvest disrupts breeding; maintain field borders; predatory birds; insecticidal sprays as last resort
Uses
Livestock Forage & Hay
CulinaryVernal alfalfa is primarily grown for high-quality hay and pasture for cattle, horses, sheep, and other livestock. It is highly palatable and nutritious, rich in protein and minerals. [source]
Herbal Medicine & Supplements
MedicinalAlfalfa has been used traditionally to support milk production in lactating animals and as a nutritive tonic in herbal medicine. It contains vitamins K, A, and minerals including calcium and iron. [source]
Nitrogen Fixation & Soil Improvement
HouseholdAs a legume, Vernal alfalfa fixes atmospheric nitrogen through symbiotic bacteria in root nodules, enriching soil and reducing the need for synthetic fertilizers in rotation systems. [source]
Pollinator & Wildlife Habitat
WildlifeAlfalfa flowers attract bees and other pollinators, supporting biodiversity. The plant also provides cover and forage for wildlife. [source]
Sprouting & Microgreens
CraftAlfalfa seeds are commonly sprouted for human consumption as a nutritious, enzyme-rich food. Alfalfa sprouts are packed with vitamins and minerals. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest at early bloom stage (bud to early flower) for highest forage quality and palatability. Cut to a height of 2-3 inches to allow for regrowth. Typical harvest timing is when 10% of flowers are open. Vernal produces 2-4 harvests annually depending on climate and moisture. For seed production, allow plants to mature fully and dry before combining.
Fun Facts
- 🌱 Vernal alfalfa was specifically bred for cold hardiness, making it one of the hardiest alfalfa varieties available for northern farming regions.
- 🌱 Alfalfa has one of the deepest root systems of any crop plant, with taproots reaching 15+ feet into the soil, allowing it to access deep water reserves and bringing up minerals from deep soil layers.
- 🌱 A single alfalfa plant can produce hundreds of seeds per flower head, and a well-established field can self-seed if allowed to mature, maintaining itself for many years.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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