Cowpea

Eastern Australian temperate forests

Fynbos shrubland

New Zealand North Island temperate forests

Brassica oleracea var. palmifolia

What it needs

Conditions

Light

Full sun

Water

Low water

Spacing

4"

Habit

A frost-tender, warm-season annual legume - bushy or twining - with trifoliate leaves, pale lilac-to-white pea flowers, and long slender pods of edible seeds

Care tips

•

Wait for warmth: cowpea is frost-tender, so sow seed directly only after the last frost once the soil is genuinely warm. Cold soil rots the seed and stalls the plant - patience here is the whole game.

•

Give it full sun and let it run: it is notably drought-tolerant and thrives in heat and poor soil, so once established it needs little water and no pampering. This is a crop for the hottest part of the season.

•

Grow it lean - do not over-feed nitrogen: as a nitrogen-fixing legume it makes its own, and rich nitrogen feeding gives you leafy growth instead of pods. Plant it into ordinary or poor soil rather than freshly fed ground.

Lifecycle

Planting

Sow seed directly after the last frost, once the soil is genuinely warm, in full sun - cowpea is frost-tender and will not grow in cold soil. Space plants about 4 inches apart in well-drained ground. Because it fixes its own nitrogen, do not plant it into rich, freshly nitrogen-fed soil; lean ground suits it and gives pods rather than all leaf.

Transplanting

Cowpea resents root disturbance and germinates quickly in warm soil, so it is best direct-sown where it is to grow rather than transplanted. If you must start it under cover to gain time in a short summer, sow into individual cells and set the young plants out only after the last frost when the soil has warmed, disturbing the roots as little as possible.

Early growth

In its first weeks the seedling grows fast in heat and forms root nodules that supply its own nitrogen. Keep weeds down while it establishes, then let it run - it is notably drought-tolerant and thrives in heat and poor soil, needing little water once away. Avoid rich nitrogen feeding, which pushes leafy growth at the expense of pods.

Maturity

A mature plant is a bushy or twining annual carrying trifoliate leaves, pale lilac-to-white pea flowers, and long slender pods of seeds. Pick young leaves as a cooked green through the season, harvest pods green for fresh seeds, or leave them to dry on the plant for dried seeds cooked like any bean. The whole cycle finishes in one warm growing season.

Propagation

Grown from seed, sown directly after the last frost into warm soil. Because it is largely self-pollinating, saved seed comes reasonably true to type, so let some pods fully ripen and dry on the plant, then shell and store the dried seeds for next year's sowing.

Plant this, not that

Better fit for this place

For Chicago, IL, these are replacement suggestions: similar plants with a stronger hardiness fit now and/or in 2050.

Lacinato kale

A productive cool-season edible Brassica (a wild-cabbage cultivar in the Acephala / non-heading group, alongside collards). Upright blue-green strap-shaped leaves with strong kitchen-garden value and ornamental texture; grown as a cool-season annual or short-lived biennial.

Vegetable

Full sun / Part sun

Consistent moisture

Zones Annual (biennial in 6a-9b)

Climate: narrow

Edible

Filler

Better fit now and in 2050

Now: well-suited

2050: well-suited

Borago officinalis

Borage

A rough, sprawling Mediterranean annual grown for showy, open racemes of drooping, star-shaped bright blue flowers in summer. Branched stems and wrinkled, dull gray-green leaves are clad in bristly hairs and carry the taste and fragrance of cucumber. Easy in poor, dry soils, drought-tolerant, a magnet for bees, and a self-seeder that returns to the garden year after year.

Herb

A vigorous spreading perennial mint forming dense colonies via aggressive underground rhizomes. Leaves are the canonical 'mint' flavor (toothpaste, gum, mojitos, lamb dishes). NC State + every herb reference flags Mentha species as highly invasive in garden beds - container-only siting is the standard recommendation. Small pink-to-white summer flowers worked heavily by bees + small pollinators.

Better fit now and in 2050

Now: well-suited

2050: well-suited

Mentha spicata

Spearmint

Herb

The iconic cornfield cornflower or bachelor's button - a slender, grey-green hardy annual carrying intense-blue (also pink, white, or purple in cultivars), fringed, thistle-like flowerheads from early to mid summer. POWO (Kew) places it native to southeastern Europe, the Balkans, and the eastern Mediterranean, naturalised across much of the temperate world as a cornfield archaeophyte. Honesty matters here: once a common cereal-field weed, the wild cornflower has DECLINED sharply across northern Europe under modern farming and is a genuine conservation concern there, even as it remains a beloved, easy, self-seeding cottage and meadow annual. Its blue florets are edible - a traditional garnish for salads, cakes, and teas. RHS gives several selections the Award of Garden Merit and rates the species fully hardy (H7). A strong nectar plant for bees and butterflies, it also bears extrafloral nectaries that feed ants and other insects.

Better fit now and in 2050

Now: well-suited

2050: well-suited

Centaurea cyanus

Cornflower

Better fit now and in 2050

Now: well-suited

2050: well-suited

Similar plants

Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.

Brassica oleracea var. palmifolia

Lacinato kale

A productive cool-season edible Brassica (a wild-cabbage cultivar in the Acephala / non-heading group, alongside collards). Upright blue-green strap-shaped leaves with strong kitchen-garden value and ornamental texture; grown as a cool-season annual or short-lived biennial.

Vegetable

Full sun / Part sun

Consistent moisture

Zones Annual (biennial in 6a-9b)

A low, ground-hugging warm-season annual legume domesticated in West Africa (around present-day Mali and Nigeria) and grown across the continent as a hardy indigenous pulse (GBIF). Trifoliate leaves rise on short, creeping stems, and after the tiny flowers are pollinated their stalks bend down and push the developing pods into the soil, so the crop ripens UNDERGROUND like a peanut. The round, hard seeds are remarkably rich in both protein and carbohydrate, making bambara groundnut a near-complete food and a staple where harsher conditions defeat other beans. It is famously DROUGHT-tolerant and productive on hot, poor, sandy soils, fixing its own nitrogen, but it is a FROST-TENDER, warm-season annual that needs a long, warm season for the underground pods to fill. RHS lists it as a tender, drought-tolerant warm-season annual pulse for full sun, its pods ripening underground (RHS). Outside the tropics it is grown as a summer annual, sown after the last frost once the soil is warm.

A fast, erect cool-season annual in the mustard family (Brassicaceae), introduced to all of North America from Eurasia and grown widely as a leafy vegetable. NC State Extension describes a rapid-growing plant about 12 to 18 inches tall and wide with large (over 6 inches) leaves - lobed lower leaves and shorter-stalked upper leaves, smooth with a whitish bloom and sometimes purple veins or fully purple coloring. It does best in the cool of fall and spring and bolts in summer heat, throwing up terminal clusters of small four-petaled yellow flowers and developing a strong, spicy flavor. The leaves, seeds, flowers, and stems are all edible raw or cooked, making it a productive, peppery green for the edible garden.

Vegetable

Zones Annual; grown as a cool-season leaf crop

Consistent moisture

A tender, tuberous-rooted morning-glory relative native to tropical America and cultivated for its starchy edible storage roots for over 2,000 years. Trailing stems mound only about 9 inches tall but sprawl 8 to 10 feet wide, rooting at the nodes, with heart-shaped to palmately-lobed leaves. The species occasionally bears pale-pink-to-violet trumpet flowers, though most cultivars rarely bloom. Winter hardy only to USDA Zones 9-11, it is grown as a warm-season annual everywhere colder.

A rough, sprawling Mediterranean annual grown for showy, open racemes of drooping, star-shaped bright blue flowers in summer. Branched stems and wrinkled, dull gray-green leaves are clad in bristly hairs and carry the taste and fragrance of cucumber. Easy in poor, dry soils, drought-tolerant, a magnet for bees, and a self-seeder that returns to the garden year after year.

Herb

A tough, deep-rooted perennial in the daisy family (Asteraceae), grown for both its sky-blue summer flowers and its many edible uses. Native to Europe and now widely naturalized along roadsides and in fields across North America, chicory sends up wiry, branching stems 3 to 4 feet tall from a long, stout taproot. The ray flowers are a clear sky-blue (occasionally white or pink), opening in the morning and closing again by midday. The same plant gives three classic harvests: bitter young leaves for cooking and salads, a roasted taproot used as a caffeine-free coffee substitute or additive, and forced, blanched shoots known as 'chicons' (Belgian endive / witloof). It thrives on poor, dry, sunny ground where pampered plants would not, and its deep taproot makes it genuinely drought-tolerant once established.

Educator packet

Plant packet

Cowpea educator packet

A warm-season annual legume domesticated in sub-Saharan Africa (GBIF) and now grown throughout the warm world, cowpea is the black-eyed pea, southern pea, and cowpea of countless kitchens - a protein-rich African staple grown for both its young leaves and its seeds. The bushy or twining plants carry trifoliate leaves, pale lilac-to-white pea flowers, and long slender pods packed with seeds (often the familiar pale seed with a black eye). HONEST CLIMATE NOTE: this is a FROST-TENDER, warm-season ANNUAL for full sun. It is notably drought-tolerant and thrives in heat and poor soil, fixing its own nitrogen from the air, so it does not want rich nitrogen feeding - too much nitrogen gives you leaves instead of pods. Sow it after the last frost once the soil is warm and let it run through a long, hot summer; outside the tropics it is grown purely as a summer annual. The dried seeds are cooked like any bean and the young leaves are eaten as a cooked green. It is bee-pollinated but largely self-pollinating, so a single plant still sets a crop.

Scientific name

Vigna unguiculata

Plant type

vegetable

Hardiness

9a-11

Light

full-sun

Moisture

low

Spacing

4 inches

Classroom prompts

- Which plant traits are observations, and which are care recommendations?

- How would this plant fit change if the garden location moved warmer, colder, wetter, or drier?

- Which source-backed facts would you cite in a lesson handout?

Use the Sources & citations section below for page citation styles and the field-level source list.

Sources & citations

Cite this page

For lesson plans, articles, or research that uses this page. Use the source cards below to explore the references that informed this record.

Plotwright. (2026, May 17). Cowpea (Vigna unguiculata). Retrieved 2026, August 20, from https://plotwright.com/plants/vigna-unguiculata

Sources used for this record

This record is compiled from the sources below.

RHS Find a Plant

Botanical research database

GBIF

Botanical research database

Wikipedia (ecoregion articles)

Botanical research database

Wikimedia Commons

Photo