Red clover
Also known as
Purple clover, Meadow clover, Cow grass, Trefoil
Keep this plant’s care guide close at hand.
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Trifolium pratense, commonly known as red clover, is a short-lived perennial legume in the pea family (Fabaceae) valued for forage, cover cropping, and pollinator support. It forms a leafy crown with trifoliate leaves marked by a pale V-shaped chevron and produces dense, rose-red to magenta, globose flower heads 1.5–3 cm across from late spring through fall. Plants typically reach 20–80 cm tall and develop a stout taproot with fibrous laterals that improve soil structure and drought resilience. As a nitrogen-fixing legume, it hosts Rhizobium bacteria that form root nodules and supply much of its nitrogen needs, reducing fertilizer inputs. Red clover thrives in cool, temperate climates and well-drained loams with near-neutral pH. It is widely used in pastures, hay, green manure rotations, and as a nectar source for bumblebees and other pollinators. While often grown agriculturally, it can be cultivated in containers or garden beds, where regular cutting encourages bushy growth and repeated flowering over its typical 2–3 year lifespan.
Taxonomy
Properties & Requirements
How to care for Red clover
Water
Keep soil evenly moist but never waterlogged. For garden or container plants, water deeply when the top 2–3 cm of soil is dry, supplying about 2.5 cm (1 inch) of water per week from rain plus irrigation. Seedlings need consistently moist, fine-tilth soil until established. Mature plants tolerate brief dry spells thanks to a taproot, but prolonged drought reduces flowering and nodulation. Use mulch to conserve moisture and prefer morning watering at the base to keep foliage dry and limit fungal issues.
Light
Provide full sun for 6–8+ hours daily to maximize growth, nitrogen fixation, and flower production. Red clover tolerates light partial shade, but shaded plants elongate, lodge more readily, and bloom less. In containers or small gardens, place in unobstructed southern exposure; indoors, it is not ideal, but the brightest south-facing window or supplemental LED grow lights (12–14 hours) can sustain short-term growth. Good air movement and spacing help reduce foliar diseases in dense, sunny stands.
Nutrients
As a legume, red clover fixes atmospheric nitrogen and needs little or no added N once nodulated. Inoculate seed with the correct Rhizobium strain before sowing, especially in new fields or sterile potting mixes. Focus on phosphorus and potassium based on soil tests; modest applications of P and K support root growth and regrowth after cutting. Maintain soil pH near 6.2–7.0 with lime if acidic. Use compost or a low-N, balanced fertilizer at establishment; avoid heavy nitrogen, which favors grasses over clover.
Temperature
Red clover is a cool-season perennial best suited to USDA Zones 3–8. Germination is reliable at 15–24°C; vegetative growth is most vigorous around 18–24°C. Established plants are winter hardy and tolerate subfreezing temperatures, surviving below −20°C with good drainage and snow cover. Heat above 30°C with drought can induce summer dormancy, shorten lifespan, and reduce flowering. Provide consistent moisture and a light mulch in hot spells, and avoid planting in frost pockets that hold standing cold air.
