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Mammoth Red Clover is a quick growing biennial prized for its ability to restore soil structure and add nitrogen to depleted soils. This clover variety grows 1 to 2 feet tall with 3-leaflet clover leaves and displays multiple round delicate & purplish pointed florets. Mammoth Red Clover will grow in more acidic soil than other clovers which usually prefer more neutral soils. The flowers are edible and may be used to garnish drinks, salads, and soups for very mild honey-like flavor. This plant provides an excellent source of forage for grazing animals and nectar for foraging bees and other pollinators. Mammoth Red Clover tolerates some shade so you can sow in between vegetable or flower rows, under tall plants such as heavy nitrogen feeding crops like corn, or under fruit trees and hardy perennials. Mammoth Red Clover is typically grown as a quick-growing biannual groundcover because of its ability to obtain nitrogen from the atmosphere and “fix” it underground onto nodules attached to its deep tap roots. This process is referred to as ‘nitrogen fixation’ and can be combined with other regenerative techniques like incorporating grazing animals, ‘green manure till-in’ techniques, mow, or cut back with a weed trimmer at the end of bloom and before seeds form. Red Mammoth Clover can re-grow after light grazing or mowing once flowering has begun to avoid reseeding.
NAME: Clover (Trifolium pratense)
VARIETY: Red Mammoth
DAYS TO MATURITY: 70 days
POLLINATION: Open Pollinated
TYPE: Grown as an annual
HARDINESS ZONE: Zones 2 – 10
SUNLIGHT: Full Sun / Partial Sun
SOIL: Average, well-draining soils with a pH 5.3 – 7.2
PLANT HEIGHT: 12 – 24 inches
SPACING: 2 inch – 3 inches
TEMP: 45 – 75 °F
These seeds do not required stratification.
To learn more about Stratification, click here!
Starting Red Mammoth Clover seeds indoors is not recommended. While it’s technically possible to start these seeds indoors, it’s generally not recommended due to the plant’s preference for direct sowing and its ability to establish easily outdoors.
If you still prefer to start seeds indoors, follow these steps:
Use biodegradable pots or trays to minimize root disturbance during transplanting. Fill the containers with a well-draining potting mix. Sow the seeds thinly on the surface of the soil and lightly press them in.
Keep the soil consistently moist and maintain a temperature of around 60-70°F (15-21°C) for optimal germination.
Place the containers in a location with plenty of sunlight or under grow lights.
Transplant the seedlings outdoors once they have developed several sets of true leaves, being careful not to disturb the roots.
Direct sow clover seed outdoors into prepared soil immediately after your last local spring frost.
Sprinkle seed around the areas you want the clover to grow.
The closer together the seeds are the smaller the plants will be but less ground will be left bare.
Lightly roll over the seeds with a tamper or lightly step on them so they press firmly into the soil, covering no more than 1/4 to 1/2 inch deep.
Water the seeds in generously and germination should occur in 7 to 20 days depending on environmental factors.
Plants will fully mature in 65 days.
Once Red Mammoth Clover reaches maturity, it will stand up to heavy mowing, animal grazing and foot or tractor compaction.
Once the plants reach maturity, you can either cut them down to the base, letting the nitrogen attached to the root nodules release into the soil, let animals feed off the tops, or leave the flowers to go to seed for self-reseeding.
Before sowing, prepare your soil by removing any weeds or large debris such as large sticks and stones, ideally giving these seeds a completely bare and leveled soil patch to sow onto in an area that is full sun to partial shade.
Once Red Mammoth Clover plants have established, they require minimal care.
Dense seed spacing is ideal for applications like ground cover, animal fodder or restoring degraded and bare soils.
Allow the flowers to go to seed for easy reseeding, or allow animals to graze on the tops!
Fantastic when used as a groundcover in soils lacking nitrogen due to its ability to obtain nitrogen from the atmosphere and “fix” it underground onto nodules attached to its roots.
Red Mammoth Clover can be harvested for forage or hay production once it reaches a height of 12-18 inches.
Harvesting can be done using conventional mowing equipment.
For hay production, harvest when the clover is in early bloom for the best balance of yield and quality.
Allow the clover to dry thoroughly before baling or storing.