🌱 Hairy Vetch

Vicia villosa

cover-crops winter annual legume

☀️ Sun

Full sun to partial shade

💧 Water

Medium; drought-tolerant once established; excessive moisture can cause disease

🗺️ Zones

3, 4, 5, 6, 7, 8, 9 (excellent cold tolerance for winter cover)

🪴 Soil Type

Adaptable to various soils including sandy and clay-loam; prefers well-drained conditions

🧪 Soil pH

6.0–7.0 (slightly acidic to neutral)

💧 Drainage

Well-drained; tolerates moderate drainage but not waterlogged soils

📏 Spacing

Broadcast at 20–40 lbs/acre alone; 15–25 lbs/acre in mix with rye

📐 Height

2–4 feet (climbing/vining growth habit)

📅 Days to Maturity

Fall planted; overwinters; reaches peak biomass in mid-to-late spring (May-June)

🍴 Edible Parts

🍽️ ["Young shoots and tendrils (limited edible use \u2014 primarily a cover crop)"🍽️ "Flowers (limited use)"]

🤝 Companions (8)

🤝 Cereal Rye

Hairy vetch-rye is the gold standard winter cover crop mix; rye supports vetch while vetch fixes nitrogen.

🤝 Wheat (following)

Wheat after vetch cover crop yields can match conventional N-fertilized wheat due to vetch's nitrogen contribution.

🤝 Corn (following)

Corn planted into rolled vetch-rye mulch receives 100+ lbs of slow-release nitrogen.

🤝 Tomato (following)

Tomatoes after vetch show exceptional yields; the nitrogen release matches tomato's peak uptake period.

🤝 Pepper (following)

Peppers benefit from vetch residue mulch; weed suppression and nitrogen release improve yields dramatically.

🤝 Squash / Pumpkin (following)

Vetch-rye mulch provides weed-free, nitrogen-rich conditions for cucurbit crops.

🤝 Oat (nurse crop)

Oats can serve as a spring nurse crop for fall-planted vetch in short-season areas.

🤝 Buckwheat (summer mix)

Buckwheat and vetch can be mixed for summer cover; buckwheat scavenges P while vetch fixes N.

⚠️ Keep Apart (4)

⚠️ Small-seeded vegetables (post-termination)

Allelopathic vetch residue inhibits lettuce, carrot, and other small-seeded crop germination for 3–4 weeks.

⚠️ Other winter legumes (in same mix)

Multiple vetch/clover species in one mix can lead to uneven maturity and complicate termination timing.

⚠️ Wet / poorly drained fields

Vetch in saturated soils develops Sclerotinia (white mold) and root rots.

⚠️ Fields with vetch seed bank

Hairy vetch can become a persistent weed in subsequent crops if allowed to set seed; timely termination is critical.

💊 Medicinal Uses

["Not typically used medicinally; primarily an agricultural crop", "Related species (Vicia faba) has traditional uses \u2014 hairy vetch seeds may contain mild toxins if consumed in large quantities"]

📜 History & Traditional Uses

Native to Europe and Western Asia; widely adopted in North America as a premier winter cover crop in the early 20th century; fundamental to organic no-till farming systems.

📝 Notes

The highest nitrogen-fixing winter annual cover crop — can fix 100–200+ lbs N/acre. Almost always planted with rye (cereal rye) for physical support. Must be terminated at full bloom (typically May) for reliable kill before summer crops. Can become weedy if allowed to set seed. Allelopathic to small-seeded crops.