Crimson Clover

Crimson clover (Trifolium incarnatum) is an annual or biennial nitrogen-fixing cover crop in the pea family, native to Eurasia. It grows to 30–50 cm tall and produces striking deep-red, pointed flower spikes that are highly attractive to pollinators and beneficial insects. It germinates rapidly and quickly covers bare soil, making it excellent for green manuring, erosion control, and undersowing. It thrives in cool, moist conditions and tolerates partial shade.

Growing

Broadcast sow directly onto a prepared seedbed from when soil reaches around 5 °C onward. Rake lightly to achieve a sowing depth of 1 cm — seed needs only shallow coverage. No indoor start is necessary. Sow at a rate sufficient to cover the ground densely; thin or aim for approximately 10 cm between plants if growing for ornamental effect. Plants sown early will flower in the same season; those sown later will overwinter and flower prolifically the following year.

Care

Water during establishment if conditions are dry; once rooted, crimson clover is largely self-sufficient in typical garden conditions. No feeding is required — as a legume it fixes its own atmospheric nitrogen via root rhizobia. Cut plants back after a flush of flowers to encourage regrowth and a second bloom. No staking needed.

Harvest

For green manure, cut or dig in plants at full flower when nitrogen content is highest. For seed saving, allow flower heads to dry fully on the plant until the seed heads turn brown and rattle; harvest before pods shatter. For ornamental cutting, harvest flower stems when blooms are freshly open.

In the kitchen

Crimson clover is primarily grown as a cover crop, green manure, and pollinator plant rather than a culinary crop. Young leaves and flowers are edible raw in small quantities as a garnish or salad addition; the flowers add vivid colour to salads and herb platters.

Storing

Fresh cut flowers last 5–7 days in water at room temperature. Dried flower heads can be stored in a cool, dry place for several months for decorative use or seed saving. Seeds saved for re-sowing should be stored in a sealed, dry container away from light; viability is maintained for 2–3 years.