How to Grow Cover Crops (Clover & Vetch)
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Cover Crops (Clover & Vetch)
Trifolium spp. (clover) / Vicia spp. (vetch)
grassCover crops are non-harvested plants grown to improve soil health, prevent erosion, and suppress weeds. Clovers and vetches are nitrogen-fixing legumes that build soil fertility naturally, making them excellent preceding crops for vegetable gardens and farm rotations.
When should you plant Cover Crops (Clover & Vetch) in your zone?
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Example Cover Crops (Clover & Vetch) timeline · Pittsburgh, PA (Zone 6b)
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Plant Cover Crops (Clover & Vetch)
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 Cover Crops (Clover & Vetch)
Around Jun 1≈ 45 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Most cover crops thrive in zones 3-9; selection varies by species and climate
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Germination & Emergence
1-2 weeksTiny seedlings appear with first true leaves within 7-14 days
Keep soil consistently moist but not waterlogged. Protect from heavy foot traffic and competing annual weeds
Seedling & Establishment
3-6 weeksRapid root development and above-ground growth; plant develops characteristic clover leaves or vetch tendrils
Monitor for pests; avoid herbicides. Allow natural colonization by nitrogen-fixing bacteria. Water during dry spells
Vegetative Growth & Biomass Accumulation
8-12 weeksVigorous leafy growth, dense canopy formation, nitrogen fixation actively occurring
Let crop grow undisturbed to maximize biomass and root development. Winter cover crops may slow growth in cold months
Flowering
2-4 weeksPurple, white, pink, or yellow flower clusters appear; continued nitrogen fixation and nodule activity peak
Avoid mowing; let flowers set to maximize nutrient cycling benefits. Can be harvested for hay or green manure at this stage
Termination & Incorporation
Variable; plan 3-4 weeks post-termination before planting cash cropPlant dies back or is actively killed via incorporation, tilling, or mowing 2-4 weeks before spring planting
Allow 14-30 days after incorporation for organic matter to decompose and nutrients to become available to next crop
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Rarely problematic in cover crop contexts; early termination reduces populations. No chemical controls needed for cover crops
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Monitor for skeletonized leaves; early spring mowing can reduce damage. Not economically significant in cover crop systems
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Rarely damaging; encourage natural predators. Early termination eliminates habitat
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Hand-pick if severe; generally not a concern since cover crop termination is planned
Uses
Forage & Hay Production
CulinaryYoung clover and vetch are nutritious livestock forage and can be cut for hay before flowering. Some farmers bale clover-rich cover crops for supplemental animal feed. [source]
Nitrogen Fixation & Soil Fertility
Soil amendmentLegume cover crops form symbiotic relationships with Rhizobia bacteria, converting atmospheric nitrogen into plant-available forms. When incorporated, 100-250+ lbs/acre of nitrogen can be added naturally to soil, reducing fertilizer needs for subsequent crops. [source]
Erosion Control & Soil Protection
HouseholdDense root systems and above-ground biomass prevent winter and spring soil erosion, protect against compaction, and reduce nutrient leaching. Especially valuable on slopes and over winter months. [source]
Pollinator & Beneficial Insect Support
WildlifeFlowering clover and vetch attract and feed bees, butterflies, and parasitic wasps that control crop pests. Leaving a small border unharvested supports beneficial insect populations entering the growing season. [source]
Weed Suppression & Soil Organic Matter
Soil amendmentThick canopy suppresses annual weeds during off-season. Upon incorporation, the biomass adds organic matter, improving soil structure, water-holding capacity, and long-term carbon sequestration. [source]
Harvest Tips
Cover crops are terminated, not harvested for consumption. Optimal timing: winter crops—terminate 2-4 weeks before spring planting; summer crops—terminate at flowering or 2-3 weeks before fall/spring planting. Terminate via tilling, mowing and incorporation, or herbicide spray (if following organic standards, use mechanical or tilling only). Allow 14-30 days post-incorporation for decomposition and nutrient release before planting cash crops
Fun Facts
- 🌱 A single legume plant can fix 50-150 lbs of nitrogen per acre per year through its Rhizobia bacterial partnership—more cost-effective and sustainable than synthetic nitrogen fertilizers.
- 🌱 Clover has been used as a cover crop for over 400 years; medieval and colonial farmers rotated clover-rich 'fallow' fields to restore soil between grain harvests.
- 🌱 Vetch plants can grow 3-4 feet tall and produce extensive root systems that penetrate hardpan layers, breaking up compacted soil and improving drainage for subsequent crops.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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