Trailing Wild Bean (Strophostyles helvola): Native Vine for Wildlife and Nitrogen Fixation

Botanical Profile

Family: Papilionaceae (pa-pil-ee-uh-NAY-see-ee)
Genus: Strophostyles (stro-foh-STY-leez)
Species: helvola (HEL-vol-a)
Synonyms: Cajanus helvulus, Dolichos helvulus, Glycine helvula, Phaseolus helvula

Description

Trailing wild bean is an annual or short-lived perennial vine with fuzzy, trifoliate leaves and twining stems reaching 3–6 feet long. Small, pinkish-purple pea flowers appear in summer, followed by slender, hairy pods 1–2 inches long. The seeds are mottled brown and black.

Habitat & Ecology

Native to sandy fields, roadsides, and open woods across eastern and central North America. A pioneer species that colonizes disturbed sites. Fixes atmospheric nitrogen via root nodules, improving soil fertility. Provides nectar for bees and butterflies; seeds eaten by quail and small mammals. Host plant for several skipper butterfly larvae.

Cultivation & Uses

Sow seeds in spring after scarification. Prefers full sun and well-drained, sandy soil. Drought tolerant. Use in native restoration, wildlife food plots, and cover crop mixes. Not typically grown as a food crop for humans (seeds are small and pods shatter), but young pods are edible.