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Rattlebox

Crotalaria sagittalis

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Category
Forb / Wildflower
Sun
Full
Soil moisture
Medium-Dry to Dry
Bloom time
Jul–Sep
Bloom color
Yellow
Notes
Annual, Acidic soil, Sand

About Rattlebox

Rattlebox is a fascinating and distinctive annual legume that adds a touch of curiosity to sandy, sun-drenched landscapes. This low-growing plant, typically reaching 4 to 16 inches in height, features hairy stems and simple, arrow-shaped leaves. In mid to late summer, it produces small, bright yellow pea-like flowers that eventually develop into inflated, blackish seed pods. As the pods dry, the seeds inside detach and rattle when shaken, giving the plant its charming common name. Native to much of the eastern and central United States, it thrives in dry, sandy prairies, fields, and roadsides. As a member of the bean family, it plays a vital role in soil health by fixing nitrogen. It is also an important host plant for the Bella Moth, whose caterpillars feed on the seeds. Rattlebox is a sun-lover that requires well-drained, even poor or acidic, sandy soils to flourish. It is a great choice for restoration projects or for gardeners looking to add a unique, ecologically significant species to a sandy wildflower meadow.

Native range

Native to 37 states:

AlabamaArkansasArizonaConnecticutD.C.DelawareFloridaGeorgiaIowaIllinoisIndianaKansasKentuckyLouisianaMassachusettsMarylandMichiganMinnesotaMissouriMississippiNorth CarolinaNebraskaNew HampshireNew JerseyNew YorkOhioOklahomaPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasVirginiaVermontWisconsinWest Virginia

County range map

BONAP county-level native range map for Crotalaria sagittalis

Range map courtesy of BONAP (Biota of North America Program).

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