Ornamental · Fabaceae
Red Clover
Trifolium pratense
Sow it once and red clover fixes its own nitrogen, feeds livestock, and feeds the soil for the crop that follows.
Full sun
Every 5–10 days
60–90 days
USDA 4–8
Overview
Red clover is a nitrogen-fixing legume that earns its keep twice over, as forage in the pasture and as a cover crop that hands free fertility to the next planting. It grows upright in a clump from a crown and a deep taproot, reaching about 1 to 2 feet (30 to 61 cm) tall, and carries the rosy-pink flower heads that bumblebees work all summer.
Treat it as a short-lived perennial. Most stands give you two or three good years before they thin, and the common medium types often act more like biennials. That short run is part of the plan rather than a flaw, since the clover reseeds, and gardeners who want longer life reach for improved cultivars or simply rotate.
It is one of the easier legumes to start. Frost-seed it into pasture during the late-winter freeze-thaw or sow it into a firm seedbed, and it establishes quicker than alfalfa, though it asks for steadier moisture in return.
Care
The short version: full sun and fertile, well-drained loam, seed inoculated with the right Rhizobium and sown shallow, steady moisture while it establishes, and a cut or graze 2 to 3 times a season.
Light
Red clover does best in full sun but takes partial sun and even partial shade in stride. The more light it gets, the denser the stand and the heavier the bloom.
Water
Give young stands steady, even moisture to help them establish, and don't let the soil bake into a dry crust. Red clover settles in faster than alfalfa but is less drought-tolerant, so it wants more reliable water through the season. Plan to water every 5 to 10 days where rain falls short.
Soil
Plant in fertile, well-drained loam or clay loam. A pH between 6.0 and 7.0 suits it, and it puts up with slightly acidic ground better than many legumes.
Temperature
The plant is tough across a wide range, hardy from about -29°F to 95°F (-34°C to 35°C). That cold-hardiness is what lets it ride out the freeze-thaw of a late-winter frost seeding.
Humidity
Ordinary outdoor humidity is fine, so there's no figure to hit. Airflow and dry foliage matter more, since warm, humid stretches are when black patch and other leaf fungi take hold.
Feeding
As a legume that fixes its own nitrogen, red clover needs little to no added N. Inoculate the seed with Rhizobium at planting so the roots can do that work, then supply phosphorus and potassium based on a soil test.
Pruning
Mow or cut for hay 2 to 3 times a year to keep the stand productive. When you're using it as a cover crop, terminate it at mid-bloom by mowing or tilling, the point where it has banked the most nitrogen.
Repotting
none
Size & spacing
12–24 in (30–61 cm) tall
When to plant
Red clover goes straight in the ground, never started indoors. Sow it in spring or late summer, or frost-seed it in late winter so the freeze-thaw settles the seed in, and the rosy heads bloom from late spring through summer.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Not typically started indoors; direct sown
- Plant: Spring or late summer; commonly frost-seeded or overseeded into small grains and pastures during freeze-thaw periods
- Harvest: Late spring through summer
Hardiness
USDA hardiness zones: 4–8
Temperature: down to -34°C
Troubleshooting
Most red clover trouble shows up as a thinning stand, weak establishment, or the diseases and pests that ride in with warm, humid weather. Read the early signs and you can reseed, cut, or rotate before a patch turns bare. Match what you see below, then act while it still helps.
The stand thins and dies back after a couple of years
Red clover is a short-lived perennial that often behaves like a biennial, so a stand that fades in its second or third season is doing exactly what the plant tends to do. Root rots and foliar disease finish off the common medium types even sooner. Let the clover reseed, frost-seed fresh plants into the thinning patches, or sow a persistent cultivar like Kenland or Freedom that holds on for 3 to 4 years.
Fix:
- Allow plants to reseed or interseed/frost-seed new clover into thinning stands
- Rotate or replant on a regular cycle
- Choose improved disease-resistant cultivars (e.g. Kenland, Freedom) that can persist 3-4 years
Patchy germination and weak, thin establishment
Most failed stands trace back to seed that was never inoculated, so the roots can't form the nodules that fix nitrogen, or to seed buried too deep in dry, crusted soil. Dig a few young plants and check the roots: no pink nodules means the inoculant didn't take. Coat the seed with fresh Rhizobium just before sowing, drop it no deeper than 1/4 inch into firm, moist soil, and time frost-seeding to the freeze-thaw so the seed works its own way into good contact.
Fix:
- Inoculate seed with Rhizobium leguminosarum biovar trifolii (true clover inoculum) just before seeding
- Sow no deeper than 1/4 inch into firm, moist soil
- Frost-seed during freeze-thaw or seed into a prepared, firm seedbed for good seed-to-soil contact
Dark blotches and ring patterns on the leaves and stems
These ringed, dark spots point to black patch disease, a fungus that flares in warm, humid weather, with anthracnose and powdery mildew sometimes joining in. The same fungus makes the slaframine behind harmless drooling in grazing animals, so it is worth catching early. Cut or graze the affected forage early and clear the clippings, skip any heavily infected hay, and lean on anthracnose- and mildew-resistant cultivars.
Fix:
- Harvest or graze affected forage early and remove clippings
- Avoid feeding heavily infected, slaframine-tainted hay
- Plant anthracnose- and mildew-resistant cultivars
Stunted plants with chewed roots and notched, yellowing leaves
Below ground, clover root curculio larvae gnaw at the roots and nodules, while above ground potato leafhoppers and clover weevils chew the foliage and trigger the yellow scorch known as hopperburn. Scout for notched leaves, leafhopper yellowing, and scarred crowns. A vigorous, well-fed stand shrugs off a lot of this feeding, and cutting early plus rotating fields breaks the pest cycles before they build.
Fix:
- Scout regularly and harvest early to reduce leafhopper damage
- Maintain vigorous, well-fertilized stands to tolerate feeding
- Rotate fields to break pest cycles
Toxicity
Red clover is safe and non-toxic for people and pets alike, and the dried blossoms even go into herbal teas. Cats, dogs, rabbits, and birds can all nibble it without worry. The only cautions are for grazing horses and livestock, and both are forage-management quirks rather than poisons.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Red clover is not on the ASPCA toxic list, so a cat that nibbles a leaf or flower has nothing to fear.
Dogs None
Dogs can mouth the foliage and blossoms without trouble. The plant carries no toxin that affects them.
Horses Mild
The clover itself is good forage and safe to graze. The only catch is mold: hay or pasture carrying the black patch fungus can set off harmless drooling, the so-called slobbers, which clears up once you switch the feed.
Rabbits Safe
Leaves and flowers make a fine treat for rabbits, fed in sensible amounts alongside their usual hay.
Livestock Mild
Cattle, sheep, and goats thrive on it. Watch only for two grazing quirks: slobbers from mold-infected forage, and frothy bloat when animals gorge on lush, pre-bloom clover, both of which good pasture management heads off.
Birds Safe
Chickens and other birds can peck at the leaves and seed heads freely, with no toxic parts to avoid.
People Safe
People have long brewed the dried blossoms into herbal tea. The flowers are edible and the plant holds nothing harmful.
Safe around pets and people. Two livestock-specific issues exist: when infected by the black patch fungus (Rhizoctonia/Slafractonia leguminicola), red clover produces the alkaloid slaframine that causes harmless but profuse drooling (slobbers) in grazing horses and cattle; and lush clover can cause frothy bloat in ruminants. Neither affects cats or dogs.
Varieties
A few red clover types turn up again and again, sorted mostly by how often you can cut them and how long the stand holds. These are the ones worth knowing by name.
Mammoth
A tall, vigorous late bloomer that piles most of its growth into a single first cutting but is slow to come back afterward.
Medium (double-cut)
The workhorse type that regrows fast enough for two or more cuttings a year and holds a stand longer than mammoth.
Kenland
An improved medium red bred with anthracnose and virus resistance that lets it persist for 3 to 4 years.
Freedom
A disease-resistant cultivar selected for greater persistence and a longer stand life than the common types.
Companions
Red clover pairs best with grasses and grains that balance the pasture or shelter the young stand, and it works as a green manure ahead of a hungry crop like corn.
Plant near
Forage grasses (e.g. orchardgrass, timothy, perennial ryegrass): Grass mixtures dilute the legume in pasture to reduce bloat risk and improve forage balance.
Small grains (wheat, oats, barley): Red clover is commonly frost-seeded or overseeded into small grains, establishing under the nurse crop and fixing nitrogen for the following crop.
Corn: Used as a green manure ahead of corn, supplying fixed nitrogen when terminated.
How to propagate
Red clover is grown from seed and only seed. The trick is less about the sowing and more about inoculating the seed and getting it firmly into moist soil.
SeedEasy
Spring or late summer; often frost-seeded in late winter during freeze-thaw · Germinates in about 7 days; establishes within a few weeks to a season
Red clover grows from seed and nothing else, sown in spring or late summer, or frost-seeded in late winter when the freeze-thaw works it into the ground. Coat the seed with Rhizobium leguminosarum biovar trifolii first, then drop it no deeper than 1/4 inch into firm, moist soil. It sprouts in about 7 days and fills in over a few weeks to a full season. The plant reseeds itself but never creeps by stolons, so it stays where you put it.
Myths
Red clover and white clover are the same plant.
They are two different clovers grown for different jobs. Red clover stands tall and upright at about 1 to 2 feet (30 to 61 cm), grows in a clump from a crown and taproot, lasts only 2 to 3 years, and leans on bumblebees for pollination. White clover hugs the ground and creeps along by stolons, lives longer, and draws mostly honeybees. Red clover never spreads by runners, which is the easiest way to tell the two apart.