Hairy Vetch

Hairy vetch (Vicia villosa) is a vigorous climbing annual legume native to parts of Europe and western Asia, widely grown as a cover crop, green manure, and forage plant. Its sprawling, hairy stems reach up to 2 metres and produce dense masses of purple-violet flowers attractive to pollinators. It fixes atmospheric nitrogen through root nodules, enriching soil for subsequent crops. It tolerates frost well and can overwinter in Scandinavian conditions when sown in autumn.

Growing

Sow seeds directly into prepared soil once soil temperature reaches at least 2 °C. Sow 2–3 cm deep at approximately 5 cm intervals in rows, or broadcast evenly and rake in. For green manure use, broadcast at 15–25 g per m². No indoor starting is necessary. The plant germinates in 7–14 days and establishes rapidly. Autumn sowing before the first hard frosts allows overwintering and early-spring growth.

Care

Hairy vetch requires minimal inputs once established. It fixes its own nitrogen and needs no supplementary feeding. Provide support — a fence, trellis, or neighbouring crop — if upright habit is desired, as stems naturally scramble. Keep weed pressure low at establishment; once the canopy closes it suppresses weeds effectively. Water during dry spells at establishment but is otherwise drought-tolerant.

Harvest

For green manure, cut or roll the entire plant down and incorporate into the top 10–15 cm of soil just as flowers begin to open — this is the point of peak nitrogen content. For forage or fodder, cut stems before seeds set. For seed saving, allow pods to turn brown and dry fully on the plant, then harvest before they shatter. The incorporation window is typically 4–6 weeks from first flowering.

In the kitchen

Hairy vetch is not a culinary crop and is not recommended for human consumption — the seeds contain toxic compounds and should not be eaten. It is grown strictly for its soil-improving and forage properties. Young leaves are palatable to livestock and can be grazed or cut for hay.

Storing

Harvested seeds for re-sowing should be dried thoroughly to below 10% moisture and stored in sealed containers in a cool, dark, dry location. Under these conditions viability is maintained for 3–5 years. Incorporated green material decomposes in the soil within 2–4 weeks at active growing temperatures.