How to Grow Alfalfa 'Vernal'
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Alfalfa 'Vernal'
Medicago sativa 'Vernal'
herbVernal is a cold-hardy, dormant-type alfalfa cultivar bred for northern climates and winter survival. This perennial legume produces nitrogen-fixing nodules and deep taproots, making it valuable for forage production, soil improvement, and livestock feed. The variety is notable for its exceptional winter hardiness and quick spring recovery.
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Example Alfalfa 'Vernal' timeline · Pittsburgh, PA (Zone 6b)
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Plant Alfalfa 'Vernal'
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 Alfalfa 'Vernal'
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-7; exceptional cold hardiness makes it ideal for northern regions
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Germination & Seedling
2-3 weeksSeeds germinate in 5-7 days with adequate moisture. Seedlings emerge with cotyledons and develop the first true leaves. Early growth is slow; the plant focuses energy on establishing its taproot system.
Keep soil consistently moist but not waterlogged. Avoid compacted soil that impedes taproot penetration. Protect seedlings from damping-off with good air circulation. Ensure seed-to-soil contact.
Vegetative Growth & Root Establishment
4-8 weeks (first season); establishes fully by year 2The plant develops its characteristic compound trifoliate leaves and rapidly extends its taproot system deep into the soil (can reach 6-15 feet). Leafy top growth becomes more vigorous once roots are established.
Minimize disturbance during first season. Do not graze or harvest heavily during establishment. Consistent soil moisture supports root development. Apply phosphorus and potassium as needed based on soil tests.
Flowering & Budding
3-4 weeks per cutting cycle; may flower multiple times per seasonPurple, lavender, or blue-violet flower clusters (racemes) appear at stem tips. Vernal exhibits fall dormancy, entering reproductive phase before winter to survive cold stress. Flowers are highly attractive to pollinators.
First-year flowering should be removed or cut to redirect energy to root development. In established plantings, allow flowering for seed production or for pollinator support. Monitor for pests during flowering.
Dormancy & Winter Survival
October/November through March/April depending on latitudeVernal alfalfa enters fall dormancy as temperatures decline, concentrating carbohydrates in the crown and roots for winter protection. Above-ground growth ceases; the plant appears brown and dormant but remains alive underground.
Leave adequate stem height (2-3 inches) going into winter to protect the crown. Avoid late-season heavy harvesting that weakens winter survival. Do not graze dormant fields, as this removes the protective stubble.
Spring Regrowth & Production
Throughout the growing season; 3-6 cuttings possible annuallyAs temperatures warm, alfalfa rapidly regrows from the crown and root system. New shoots emerge quickly, and the plant enters the primary productive phase. Multiple harvests are possible per growing season.
First spring cutting should occur at early bloom or late bud stage (35-50 days of growth) to maximize forage quality. Make subsequent cuts every 25-35 days. Ensure adequate moisture during active growth.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Monitor for larvae in spring; early cutting can reduce populations; predatory insects provide biological control; insecticidal spray if thresholds exceeded
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Encourage beneficial insects like ladybugs; early harvest removes infested material; insecticidal soap or neem oil for severe infestations
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Regular scouting; early cutting removes host material; Bacillus thuringiensis (Bt) for larvae; conservation of natural predators
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Monitor with sweep nets; maintain plant vigor through proper irrigation; reflective mulches; insecticidal soap if necessary
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Ensure good air circulation; avoid excessive shade; sulfur fungicide if severe; resistant varieties like Vernal show good tolerance
Uses
Livestock Forage & Hay
CulinaryAlfalfa is a premium feed for dairy cattle, beef cattle, horses, goats, and rabbits, providing high protein content (15-22% crude protein in properly harvested hay) and excellent digestibility. Vernal's cold hardiness ensures reliable production in northern regions where other forages may struggle. [source]
Alfalfa Sprouts
CulinaryYoung sprouts are nutrient-dense additions to salads and sandwiches, containing enzymes, vitamins, and minerals. Sprouts can be home-grown indoors year-round from alfalfa seed. [source]
Traditional Herbal Medicine
MedicinalAlfalfa has been used in traditional medicine to support digestion, boost vitality, and provide minerals including calcium, magnesium, and iron. Modern herbalists use dried leaf for tea or supplements. [source]
Soil Nitrogen Fixation & Cover Cropping
HouseholdAlfalfa's symbiotic relationship with Rhizobium bacteria allows it to fix 100-300 lbs of nitrogen per acre annually, enriching soil and reducing the need for synthetic nitrogen fertilizers. Excellent for rotational farming and pasture improvement. [source]
Pollinator & Wildlife Support
WildlifePurple flowers attract bees, butterflies, and other pollinators, supporting ecosystem health. Alfalfa fields provide habitat and forage for beneficial insects and wildlife. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
In the first year, remove or lightly cut flowers to encourage root development; do not harvest. Starting in year 2, cut alfalfa at early bloom or late bud stage (when flowers just beginning to appear) for highest nutritional quality. Cut every 25-35 days during the growing season depending on rainfall and temperature. Leave 2-3 inches of stubble to protect the crown and allow regrowth. Never harvest after August 15 in northern zones to allow hardening-off before winter. Use a sickle bar mower, flail chopper, or rotary mower. Optimal harvest timing balances forage quality (protein content) with yield.
Fun Facts
- 🌱 Alfalfa's taproot system can penetrate 15-30 feet deep, allowing it to access water and nutrients far below the soil surface—making it an exceptionally drought-tolerant plant once established.
- 🌱 The name 'alfalfa' comes from Arabic 'al-fasfasah' meaning 'father of all foods,' reflecting its historical importance as a supreme livestock feed across Middle Eastern and Mediterranean cultures.
- 🌱 Vernal alfalfa's fall dormancy is a critical adaptation; by shifting energy to root reserves and crown carbohydrates in autumn, it can survive extreme cold snaps that would kill non-dormant varieties, making it invaluable for northern agriculture.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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