A heat-loving southern pea that keeps setting pods through drought and midsummer, then leaves nitrogen in the soil behind it.
Vigna unguiculata · also called Black-eyed pea, Southern pea
Windows are counted from the average date of your last spring frost.
It produces shelling peas, snap pods, and edible young leaves during the weeks when garden peas and green beans stall in the heat. Bacteria in its root nodules capture nitrogen from the air, most of which benefits next season's crop.
A little history. Domesticated in West Africa and grown across the tropics. Deep roots and small, thick leaves let it hold production on less water than most garden beans.
Sow seeds 1 inch (25 mm) deep, and aim for 4 inches (10 cm) between plants once thinned. Water once at sowing, then keep the top inch damp until shoots break through. Do not soak seed beforehand; it rots in cold, wet soil. Seedlings emerge in 5–10 days.
Soak once a week; more often only during flowering and pod fill. Water when the top 2 inches of soil are dry and leaves look dull at midday. Aim for about 1 inch per week including rain.
One compost dressing worked in before sowing; nothing after. What to use: compost, or a low-nitrogen 2–4-4; heavy nitrogen gives vines and few pods.
Pinch the growing tips of vining types once they reach 3 ft to keep them within their space and encourage branching.
It's ready when snap pods are firm, bright, and pencil-thick. Shelling peas fill the pod and the shell turns papery. Dry peas rattle in a tan, brittle pod. Hold the stem with one hand and pull the pod with the other, or snip with scissors — the stems break easily. Pick every 3–4 days for snaps, and pull dry pods on a rainless afternoon.
Fresh shelled peas keep 4–5 days refrigerated in a covered container. Dry peas store a year in a sealed jar kept cool and dark.
Sow a fresh block every 3 weeks through midsummer for a steady supply of shelling peas until frost.
Sorghum
Cowpea and sorghum are a long-studied intercrop: the cowpea covers open ground between the tall stalks and its root nodules bank nitrogen that is released mainly next season as the roots break down. Sow cowpea between sorghum rows once the grain is knee-high.
Pearl Millet
Grown in alternating rows with pearl millet, cowpea uses the light the grain does not intercept and adds nitrogen to the bed that mostly becomes available to following crops. Both handle heat and dry spells, so neither strains the other for water.
Foxtail Millet
Sprawling cowpea shades the soil surface between shallow-rooted millet, which often reduces weeding and slows moisture loss in midsummer. Its nitrogen contribution shows up in the following season rather than the current one.
Proso Millet
Proso millet feeds in the top layer of soil while cowpea sends roots deeper, so the two can share a bed with less competition for water during a dry stretch. Keep the millet on the sunny side to avoid shading the cowpea flowers.
Teff
Teff is fine-rooted and slow to close its canopy, so cowpea running along the ground beside it can help hold soil moisture and crowd out early weeds. Give the cowpea its own row rather than sowing the two seeds mixed.
Edible Hibiscus
Edible hibiscus grows tall on bare stems, leaving open soil that dries and weeds up. A skirt of cowpea shades that ground, and its nodules add nitrogen the bed can use next season. Keep the cowpea 12 in out from the hibiscus stems.
Roselle
Roselle takes months to fill its space, and low cowpea planted between young plants covers the soil in the meantime, holding moisture through the hot weather both crops need. Pull or cut the cowpea back once roselle branches begin to spread.
Sweet Corn
Vining cowpea varieties will climb a corn stalk the way pole beans do, lifting pods off the ground for easier picking. Sow the cowpea after the corn is 12 in tall so the grain gets a head start.
Sunflower
Sunflower heads draw in hoverflies, lacewings, and tiny parasitic wasps that work over aphid colonies on nearby cowpea tips. Place sunflowers on the north side so they do not shade the cowpea row.
Fennel
Fennel roots release substances that reliably stunt most garden vegetables, cowpea included. Grow it in its own corner or a pot well away from the row, where its flowers can still feed hoverflies and tiny parasitic wasps.
Old charts keep beans and peas away from onions, garlic, and leeks. No mechanism has been demonstrated in trials, so treat it as a hedge rather than a rule — if space is tight, plant them together and watch your own results.
Creeping perennial grasses out-muscle young cowpea for water and light before the crop's canopy closes. Clear runners from the bed and edge it before sowing rather than trying to weed around sprawling vines later.
Give the pea and bean family 2 years away from this spot before any of its relatives return.
The cabbage family, the beet family or grasses and grains thrive in this ground next season.
Cowpea is a giver: its root nodules leave nitrogen behind for the next crop as the roots break down. Keep pea and bean family crops out of this bed for 2 years, then follow with cabbage-family greens, beets or chard, or a grain such as sorghum or millet.
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