How to Grow Clover (Cover Crop)
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Clover (Cover Crop)
Trifolium spp.
grassClover is a nitrogen-fixing legume commonly used as a cover crop to improve soil health and suppress weeds between vegetable or crop rows. Its deep root system breaks up compacted soil while its symbiotic relationship with rhizobia bacteria converts atmospheric nitrogen into plant-available forms, reducing the need for synthetic fertilizers. Clover also provides beneficial habitat for pollinators and predatory insects.
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Example Clover (Cover Crop) timeline · Pittsburgh, PA (Zone 6b)
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Plant Clover (Cover Crop)
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Clover (Cover Crop)
Around Jun 1≈ 45 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Zones 3-9; cold-hardy varieties thrive in colder regions
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Germination & Seedling
2-3 weeksTiny cotyledons emerge 5-10 days after planting. First true leaves appear clover-shaped but single or paired.
Keep soil consistently moist but not waterlogged. Avoid foot traffic. Remove competing weeds by hand if needed.
Establishment & Early Growth
3-4 weeksMultiple trifoliate (three-lobed) leaves develop. Plant reaches 3-6 inches tall with developing root system establishing nodules.
Reduce watering gradually. Inoculated nodules begin nitrogen fixation. Do not fertilize with nitrogen, as it inhibits nodule formation.
Vegetative Growth & Ground Coverage
4-8 weeksDense low growth 6-12 inches tall creates a thick mat between crop rows. Foliage is lush green; root system deepens.
Monitor for pests and diseases. Mow if growth exceeds crop canopy and shades main plants. Allow some flowering for pollinator benefit.
Flowering
2-4 weeksSmall flower heads (white, red, or pink depending on species) appear among foliage, attracting bees and beneficial insects.
Allow flowering to support pollinators and beneficial insects. Delay termination to maximize biomass and nitrogen accumulation.
Termination & Incorporation
Varies; best after frost or 2-3 weeks pre-plantingClover is killed by cold frost, mowing, or tilling. Decaying biomass adds organic matter and releases nitrogen to soil.
Terminate 2-3 weeks before planting next crop to allow decomposition. Mow first, then till. Or allow frost kill in fall for spring incorporation.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick adults; encourage parasitoid wasps; use neem oil if severe. Typically not problematic in cover crop context.
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Tolerate minor damage; mow to disrupt life cycle; encourage natural predators and parasitoids.
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Encourage ladybugs and lacewings; spray strong water stream to dislodge; use insecticidal soap only if severe.
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Improve air circulation; avoid overhead watering; resistant varieties; typically self-limiting.
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Ensure good drainage; space plantings for airflow; rotate cover crops; not usually severe.
Uses
Edible Flowers & Greens
CulinaryClover flowers and young leaves are edible with a mild, slightly sweet flavor. Often used in salads, teas, and as garnish in gourmet cuisine. [source]
Nitrogen Fixation & Soil Improvement
HouseholdClover's symbiotic relationship with Rhizobium bacteria converts atmospheric nitrogen into bioavailable nitrate, significantly improving soil fertility and reducing synthetic fertilizer needs in subsequent crops. [source]
Traditional Herbal Remedy
MedicinalRed clover is used in herbal medicine, traditionally for blood purification, hormone balance, and respiratory health, though scientific evidence remains limited. [source]
Pollinator & Beneficial Insect Support
WildlifeClover flowers provide excellent nectar and pollen for honeybees, bumblebees, and native pollinators. The dense growth also harbors ground beetles and parasitoid wasps that control garden pests. [source]
Weed Suppression & Erosion Control
HouseholdDense clover growth outcompetes weeds, reducing hand-weeding labor. Its root system also stabilizes soil and prevents erosion between crop plantings. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Clover cover crops are not harvested for yield like vegetables. Instead, terminate at the right stage: (1) After flowering but before hard frost for winter kill; (2) In spring after final frost, mow and till 2-3 weeks before planting next crop; (3) For early summer crops, plant clover in fall, let frost kill it, and till in early spring. Mow to 3-4 inches before tilling to prevent tying up mower.
Fun Facts
- 🌱 A single clover plant can produce 100+ flower heads and fix 100-300 lbs of nitrogen per acre per year, equivalent to costly synthetic fertilizer applications.
- 🌱 Red clover (Trifolium pratense) blooms attract over 15 native bee species and can increase overall garden pollination by 30-40%.
- 🌱 Clover was historically called 'poor man's fertilizer' because farmers could grow it for free rather than purchase nitrogen-rich manure or chemical inputs.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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