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What are Cowpeas?
Cowpeas (Vigna unguiculata) are a warm-season annual legume in the pea family (Fabaceae), native to sub-Saharan Africa and one of the oldest cultivated crops on earth. They go by many names — black-eyed peas, southern peas, field peas, and crowder peas — depending on regional tradition and culinary or agronomic context. In agricultural use, the term 'cowpeas' generally refers to the broad species grown as a forage, cover crop, or wildlife food plot crop rather than the table varieties selected for human consumption. Cowpeas are adapted to hot, dry, low-fertility environments in a way that few other annual legumes are. They have deep root systems that access subsoil moisture during surface droughts, they nodulate with Bradyrhizobium strains that function in higher soil temperatures than the Rhizobium strains used by clovers, and they continue growing and fixing nitrogen at temperatures that stress or kill other cover crop species. This combination of heat tolerance and drought tolerance makes them the logical choice for summer cover cropping in the hot, dry intervals of southeastern, southwestern, and mid-South farming systems. Cowpeas also produce abundant seed pods that are highly nutritious and palatable to white-tailed deer, bobwhite quail, wild turkey, and mourning doves, which positions them uniquely as a dual-purpose agronomic and wildlife management tool.
Specifications
Seeding Specs
Water Needs Low to Moderate (drought tolerant)
Soil Preference Well-drained loam to sandy loam; excellent drought tolerance; avoid waterlogged or heavy clay soils
Soil pH pH 5.5-7.0
Planting Depth 1-2 inches
Establishment Specs
Height 12-24 inches (bush); 36-60 inches (vining types)
Color White/purple flowers; green to tan seed pods
Uses Cover Crop, Nitrogen Fixation, Food Plot, Wildlife, Drought Tolerant
Native/Introduced Introduced — Sub-Saharan Africa
Why Choose This Seed?
Drought Tolerance
Cowpeas are one of the most drought-tolerant warm-season annual legumes commonly available for cover crop use. Once established with a developed root system (typically 3-4 weeks after planting), cowpeas can survive extended dry periods that would cause stand loss or complete failure in sunn hemp, berseem clover, or other warm-season legumes. Their root systems penetrate 3-6 feet into the soil profile, accessing subsoil moisture and breaking up compaction layers in the process. In the Southeast and Southwest, where summer dry spells between rains are common, this makes cowpeas the reliable option where other summer legumes are a gamble.
Wildlife Value
Cowpeas are one of the top food plot species for deer, quail, turkey, and doves across the Southeast and Gulf Coast. Deer browse heavily on cowpea leaves and vines from establishment through season, then switch to seed pods as they fill. Bobwhite quail and wild turkey consume both insects attracted to the plants and the seeds directly. Mourning doves flock to harvested or failed cowpea fields for fallen seed. For landowners who want a single planting that serves both as a soil-improving nitrogen fixer and a reliable wildlife magnet from summer through fall, cowpeas are difficult to beat. Seeding rate for food plots can be reduced to 25-40 lbs/acre in smaller plots.
Nitrogen Fixation in Hot Conditions
Cowpeas nodulate with Bradyrhizobium strains that function efficiently at soil temperatures between 77-95°F — significantly higher than the optimal temperature range for Rhizobium strains used by clovers and vetch. This means cowpeas fix nitrogen effectively during the hottest part of summer when other legume covers either cannot establish or fix poorly due to heat stress on their bacterial partners. In fields with recent soybean history, native Bradyrhizobium populations may support fixation without additional inoculant. In other fields, use a cowpea-compatible Bradyrhizobium inoculant. Expect roughly 60-150 lbs N/acre in a well-inoculated, full-season stand.
Fast Summer Establishment
Cowpeas germinate in 5-10 days when soil temperature is at or above 65°F and establish rapidly in hot conditions, producing ground cover within 3-4 weeks of planting. In the southeastern United States, cowpeas can be planted as a rapid summer cover after wheat harvest (June-July) and produce significant nitrogen-fixing biomass before fall cash crop planting in late summer or early fall. They are large-seeded, which allows them to push through moderate surface residue and establish in no-till conditions better than small-seeded legumes. Germination is consistent and reliable once soil temperature is adequate.
Honest About Limitations
Cowpeas require warm soil — 65°F minimum, 70°F+ optimal. Planting into cool soil in early spring will result in poor germination, slow growth, and vulnerability to seed rot. Do not plant until at least 2 weeks after your corn planting date as a rough guide. A single frost kills cowpeas immediately. In zones 5-6, the growing window is short enough that cowpeas are a viable but compressed option — not the ideal choice if you need a full-season cover. Cowpeas also require a relatively high seeding rate (40-80 lbs/acre broadcast) because of their large seed size, which means higher per-acre seed cost than small-seeded legumes on a weight basis.
How to Plant Cowpeas
Site Prep
Cowpeas are tolerant of low-fertility and moderately poor soils but perform best in well-drained loam or sandy loam with pH 5.5-7.0. They do not tolerate waterlogged conditions. In no-till systems, large cowpea seed can push through moderate surface residue but benefits from row clearing if residue is heavy. In conventional till systems, disk and till to create a seedbed with adequate tilth for 1-2 inch seed placement. Remove heavy crop residue or chop it into smaller pieces if broadcasting — very thick residue mats reduce seed-to-soil contact significantly. Soil fertility should be adequate for basic plant growth; apply phosphorus if severely deficient, but do not apply nitrogen.
Seeding
Drill at 30-60 lbs/acre at 1-2 inch depth using a standard grain drill. Broadcast at 40-80 lbs/acre and incorporate by discing to 1-2 inch depth or cultipacking firmly. The seeding rate is high because cowpeas are large-seeded — the rate is in pounds, not seeds per square foot. Target stand density is 3-6 plants per square foot. Inoculate with Bradyrhizobium (cowpea-compatible inoculant) before planting; in fields with soybean history in the last 5 years, inoculant may not be necessary but is inexpensive insurance. For food plot use, a seeding rate of 25-40 lbs/acre is sufficient in smaller plots.
Establishment
Germination occurs in 5-10 days in warm soil. Cowpea seedlings emerge vigorously and grow quickly under warm temperatures — plants will be 6-10 inches tall within 2-3 weeks of emergence. Once established, they require minimal management: no nitrogen fertilizer, minimal irrigation in most rainfall environments, and no replanting. Check root nodules at 4-6 weeks by pulling a plant and examining root tissue — pink to red interior nodules confirm active nitrogen fixation. White or absent nodules indicate inoculant failure; apply liquid inoculant as a soil drench if early nodulation check shows absence.
Termination / Management
For nitrogen credit, terminate cowpeas at pod-fill (60-90 days) before seed maturity, when nitrogen concentration in the biomass is highest. Incorporate by tillage or roller-crimp; cowpeas terminate easily because of soft stem tissue. For food plot management, allow cowpeas to grow through pod-fill and leave the standing crop for wildlife access through fall — deer and turkey will work the field through the season. If managing for dove, allow seed to mature and fall before discing lightly to expose seed on the soil surface. In rotations where the field will be planted to a fall cash crop, terminate at least 2-3 weeks before the next planting to allow biomass decomposition.
Helpful Resources
Cover Crop Planting Guide
Summer Cover Crops for Warm Climates
Questions & Answers
What is the difference between cowpeas and black-eyed peas?
Black-eyed peas are cowpeas — they are the same species (Vigna unguiculata). The name 'black-eyed peas' refers to the table vegetable varieties selected for culinary use, while 'cowpeas' typically refers to agronomic and forage varieties selected for biomass, ground cover, and livestock or wildlife forage. Cover crop cowpea varieties are generally not the same varieties sold in grocery stores — they have been selected for rapid vegetative growth, high biomass, and good nodulation rather than seed palatability or tender pod texture. For agricultural cover crop use, use cover crop or forage cowpea varieties rather than garden black-eyed pea varieties, which tend to be lower-biomass and may not perform as well agronomically.
What inoculant do cowpeas need?
Cowpeas need Bradyrhizobium — specifically strains in the cowpea miscellany group, which includes the same strains used for soybeans, mung beans, and most tropical legumes. A Bradyrhizobium japonicum (soybean) inoculant often works because of strain overlap, but a dedicated cowpea inoculant is more reliable. If soybeans were grown in the same field in the last 5 years with good nodulation results, there is likely a native Bradyrhizobium population adequate for cowpeas. In fields without recent soybean or cowpea history, always inoculate. Clovers, vetch, and alfalfa inoculants use different Rhizobium strains and will not work for cowpeas.
How do I know if the soil is warm enough?
Cowpeas need soil temperature at 65°F minimum and 70°F+ for optimal germination. Planting into cool soil causes slow germination, seed rot, and weak stands. The practical test: if your corn is in the ground and 2+ weeks have passed since your corn planting date, soil temperatures are typically warm enough for cowpeas. You can also buy an inexpensive soil thermometer and measure directly at 2 inch depth in the morning — morning measurements are the most conservative reading of daily soil temperature. Do not plant cowpeas because the calendar date looks right — plant when the soil temperature confirms conditions are correct.
Are cowpeas good for wildlife food plots?
Cowpeas are one of the best food plot species available for deer, quail, turkey, and doves in the Southeast and Gulf Coast. Deer begin browsing cowpea leaves and vines shortly after establishment and continue through pod-fill. Quail use cowpea fields heavily for both insects (which are attracted to the flowers and pods) and direct seed consumption. Dove and turkey will work the field in the later season when pods begin to mature and shatter. For maximum wildlife impact, plant at least 1-2 acres of cowpeas and avoid spraying insecticides — the insect activity on the plants is part of the wildlife value, especially for quail broods. Allow some pods to remain on standing plants rather than incorporating the entire stand.
Can cowpeas fit into a short double-crop window?
Cowpeas are one of the best options for short summer cover crop windows. In the Southeast, they can be planted after small grain harvest in June and will produce meaningful biomass and nitrogen fixation before late-summer cash crop planting. The key variable is having at least 60-70 frost-free days from planting to incorporation. In very tight windows (less than 60 days), cowpeas will still germinate and establish but won't have time to reach pod-fill, which means the nitrogen credit will be on the lower end of the range — approximately 30-60 lbs/acre rather than the 100-150 lbs/acre a full-season stand can reach. Even the shorter-window performance is meaningful and the ground cover benefit is immediate.
Will cowpeas grow in poor soil?
Cowpeas tolerate poor soils better than most annual legumes — this is part of their evolutionary adaptation to low-fertility African savannas. They will establish in sandy, low-organic matter soils that limit the performance of clovers and vetch. However, severely acidic soils (below pH 5.5) will impair both germination and Bradyrhizobium nodulation. Highly waterlogged or compacted soils will also cause problems. If your soil is pH 5.5-6.0, cowpeas will perform better than clovers in that pH range. Below 5.5, lime the soil or choose an acid-tolerant species. Cowpeas do not need phosphorus or potassium at high rates but will respond to modest applications on severely depleted soils.
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