How to Grow Alfalfa 'Vernal DK 145'

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Alfalfa 'Vernal DK 145'

Medicago sativa L.

herb

Vernal DK 145 is a high-yielding alfalfa cultivar bred for cold-hardy, disease-resistant performance in temperate climates. This perennial legume is widely used for livestock forage, hay production, and soil nitrogen enrichment through its symbiotic relationship with nitrogen-fixing bacteria. The variety is notable for its improved winterhardiness and disease tolerance compared to older cultivars.

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Example Alfalfa 'Vernal DK 145' timeline · Pittsburgh, PA (Zone 6b)

Plant Alfalfa 'Vernal DK 145'
Around Apr 17

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

Watering, feeding, and pest-watch reminders.
Harvest Alfalfa 'Vernal DK 145'
Around Aug 15

≈ 120 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Alfalfa 'Vernal DK 145' dates for your own zip code.

Growing Conditions

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Sun: Full sun, 6-8 hours minimum daily; 8+ hours preferred for maximum yield

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Water: Moderate to deep watering; alfalfa is drought-tolerant once established with deep taproot reaching 10+ feet. Requires 15-20 inches annual rainfall or supplemental irrigation. Avoid waterlogged conditions which promote root rot.

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Spacing: 6-12 inches

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Days to maturity: 120-150 days to first cutting (seed to harvestable hay)

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Planting depth: 0.25-0.5 inches; very shallow seeding is critical

Soil

Type: Well-draining loamy soil, ideally slightly alkaline

pH: 6.5-7.5

Amendments:

Phosphorus (P) Potassium (K) Boron Lime (if pH below 6.5) Well-rotted compost for organic matter

Growing Zones

Find your zone →

Thrives in zones 3-7, with exceptional cold tolerance down to zone 2

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

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Growth Stages

Germination & Emergence

7-10 days

Small seedlings with cotyledons and first true leaves appearing

Keep soil consistently moist but not waterlogged. Avoid compaction. Protect from heavy rain impact which can wash away fine seeds.

Seedling & Establishment

3-4 weeks

Multiple true leaves developing, 2-4 inches tall with visible compound leaf structure beginning

Maintain adequate moisture. Control early weeds by hand or light cultivation. Monitor for seedling diseases.

Vegetative Growth

4-6 weeks

Plant reaches 8-12 inches; deep taproot establishing, abundant foliage with compound leaves, branching increases

Reduce watering slightly as taproot deepens. Continue weed management. Allow plant to develop strong root system before grazing or first cut.

Pre-flowering

2-3 weeks

Plant 12-18 inches tall, flower buds forming at stem terminals, dense foliage production

This is optimal first-harvest stage. Monitor moisture. Avoid overwatering which reduces nutrient density.

Flowering & Regrowth

Variable; 3-5 cuttings possible per season

Purple/blue flowers blooming on terminal spikes; after cutting, new shoots rapidly regenerate from crown

Harvest at bud to early bloom stage for highest quality and nutrition. Allow 30-35 days between cuts for regrowth. Provide recovery period in fall before frost.

Companion Planting

Plan your garden →

Plant with:

Orchardgrass Timothy grass Bromegrass Birdsfoot trefoil Wheatgrass

Avoid planting near:

Alfalfa (same variety, to prevent monoculture pest buildup) Sunflowers Brassicas in rotation immediately (allow 2-year gap)

Common Pests

Early spring cutting before larvae mature; insecticides if population exceeds 5 larvae per stem; parasitoid wasps (Bathyplecis anurus) provide biological control
Resistant varieties like Vernal DK 145 provide tolerance; insecticidal soap for severe infestations; encourage natural predators
Early cutting disrupts life cycle; resistant cultivars; ladybugs and parasitoid wasps offer biological control
Timely cutting to remove habitat; insecticides during outbreak years; maintain field perimeter management
Ensure excellent drainage; avoid overwatering and waterlogging; practice crop rotation; resistant varieties like Vernal DK 145
Plant resistant cultivars; remove infected plants; improve soil drainage and aeration

Uses

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Livestock Forage & Hay

Culinary

Vernal DK 145 is a premium hay and pasture crop for cattle, sheep, horses, and goats, providing excellent protein (15-20%) and digestibility. High-quality alfalfa hay commands premium prices in equine and dairy industries. [source]

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Herbal & Nutritional Supplement

Medicinal

Alfalfa contains saponins, flavonoids, and phytoestrogens traditionally used in herbal medicine for joint health, cholesterol management, and vitamin K supplementation. Fresh sprouts are nutrient-dense superfoods. [source]

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Soil Nitrogen Enrichment

Household

As a nitrogen-fixing legume, alfalfa forms symbiotic relationships with Rhizobium bacteria, naturally adding 100-300 lbs of nitrogen per acre annually. Perfect for sustainable agriculture and soil regeneration. [source]

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Pollinator & Wildlife Habitat

Wildlife

Alfalfa flowers attract bees, butterflies, and beneficial insects, supporting pollinator populations and creating biodiversity. The dense foliage provides cover for ground-nesting birds and beneficial insects. [source]

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Seed Production & Breeding

Craft

Vernal DK 145 is valued in seed production systems for its reliable seed set and genetic stability, supporting commercial seed operations and breeding programs for improved cultivars. [source]

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

Harvest Tips

First cutting typically at bud stage or early bloom (60-90 days after planting), when digestibility is highest. Subsequent cuttings every 30-35 days depending on growing conditions. For hay: cut in late morning after dew dries, allow 2-3 days drying to 15-20% moisture content. For grazing: allow boot to early bloom stage; strip graze or rotational grazing preferred to avoid soil compaction. Final fall cutting should be made 4-6 weeks before first frost to allow crown recovery and winter survival.

Fun Facts

🌱 Vernal DK 145 was developed through extensive breeding programs specifically to withstand harsh winters of the Upper Midwest and northern climates, making it hardier than many global alfalfa cultivars; 'DK' refers to the Danish-based DLF-Trifolium breeding program that created it.
🌱 A single alfalfa plant can develop a taproot extending 10-15 feet deep, allowing it to access water far below the soil surface during droughts—some roots have been documented reaching 40+ feet in ideal conditions.
🌱 Alfalfa flowers change color after pollination from purple/blue to yellow/brown, providing visual cues to bees about which flowers have been visited and still contain nectar.

Gardening Terms

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

Annual Crown Cultivar Full Sun Perennial True Leaves

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