How to Grow Legume Ground Covers
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Legume Ground Covers
Fabaceae family (various genera)
ground coverLegume ground covers are low-growing plants from the bean/pea family that spread horizontally to blanket soil, suppress weeds, and fix atmospheric nitrogen. They include species like clover, vetch, and lupine that improve soil fertility while providing aesthetic ground coverage. These plants are environmentally beneficial, reducing the need for synthetic fertilizers while creating habitat for pollinators.
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Example Legume Ground Covers timeline · Pittsburgh, PA (Zone 6b)
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Plant Legume Ground Covers
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 Legume Ground Covers
Around May 17≈ 30 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Varies by species; most thrive in zones 3-9, with some cultivars suitable for zones 2-10
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Get my Legume Ground Covers timeline →Growth Stages
Germination & Seedling
2-3 weeksSeeds sprout within 7-14 days; tiny cotyledons emerge and first true leaves develop
Keep soil consistently moist but not waterlogged. Thin seedlings if densely sown. Inoculate soil with Rhizobium bacteria at planting or pre-treat seeds.
Vegetative Establishment
4-8 weeksPlant develops compound leaves, trailing stems begin spreading, root system deepens including nitrogen-fixing nodules
Water regularly during dry spells. Allow runners to spread freely. Minimal fertilizer needed; Rhizobium nodules provide nitrogen. Light mulching can suppress competing weeds.
Flowering
4-8 weeksCharacteristic pea-family flowers appear (white, pink, purple, yellow depending on species). Flowers attract bees and other pollinators
Do not fertilize with high-nitrogen products, as this reduces flowering and nitrogen-fixing ability. Allow flowers to mature for seed production and pollinator benefit.
Seed Development & Maturation
6-10 weeksFlowers transition to seed pods. Coverage becomes increasingly dense as runners spread and interconnect
Allow seed pods to mature for natural re-seeding and continuous cover. Established stands require minimal maintenance.
Established Ground Cover
OngoingDense mat of foliage completely covering soil; suppresses weeds effectively and provides year-round structure (or seasonal, depending on species)
Mow or cut back annually in spring to rejuvenate and prevent thatch buildup. Divide or transplant sections for expansion. Nitrogen-fixing continues to enrich soil.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Usually harmless; hosing off with water if problematic. Maintain good air circulation
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and
Remove by hand, use slug baits, improve drainage, or encourage ground beetles
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Spray with strong water stream or insecticidal soap; encourage ladybugs and parasitic wasps
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Ensure good air circulation; avoid overhead watering; neem oil if severe
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Improve drainage with sand or perlite; reduce watering; remove affected sections
Uses
Nitrogen Fixation & Soil Improvement
EcologicalLegume ground covers form symbiotic relationships with Rhizobium bacteria in root nodules, converting atmospheric nitrogen into plant-available forms that enrich soil. This benefit persists after mowing or incorporation, reducing or eliminating the need for synthetic nitrogen fertilizers. [source]
Weed Suppression & Low-Maintenance Landscaping
HouseholdDense legume ground covers outcompete weeds, reducing manual weeding labor and chemical herbicide use. Once established, they require minimal water, fertilizer, or care compared to turf grass. [source]
Pollinator & Beneficial Insect Habitat
WildlifeLegume flowers are rich nectar and pollen sources that attract bees, butterflies, and other pollinators. The dense foliage provides shelter for ground beetles, spiders, and other beneficial insects. [source]
Green Manure & Soil Amendment
CraftLegume ground cover biomass can be mowed and composted or tilled into garden beds as green manure, adding organic matter and fixed nitrogen to improve soil structure and fertility. [source]
Forage for Livestock
CulinarySome legume ground covers (particularly clovers and vetches) are nutritious livestock feed, and pasturing animals on legume cover improves soil health while providing food. [source]
Harvest Tips
Legume ground covers are not typically harvested for food. Instead, allow them to mature and self-seed. Mow annually (late winter or early spring before new growth) to maintain vigor and prevent thatch. Some species can be cut for green manure/compost. Collect seed pods in late summer/fall for propagation or broadcast spreading.
Fun Facts
- 🌱 A single established legume plant can fix up to 100 pounds of atmospheric nitrogen per acre per year through its symbiotic relationship with Rhizobium bacteria—equivalent to multiple applications of synthetic fertilizer.
- 🌱 Clover is edible and was historically used in herbal teas and salads; its flowers are also valued as a honey source, producing distinctive light-colored clover honey.
- 🌱 Legume ground covers have been used in sustainable agriculture for thousands of years; Roman farmer Columella recommended plowing clover into fields to restore soil fertility between crop cycles.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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