About Desmanthus illinoensis (Michx.) MacMill. ex B.L.Rob. & Fernald
Desmanthus illinoensis, commonly called Illinois bundleflower, prairie-mimosa, or prickleweed, is a common plant native to the central, southern, and midwestern United States. It often grows along roadsides, especially on southern-facing exposures. This species requires full sun and ample moisture throughout its short growing season, and mature plants frequently grow and flower in regularly mowed areas. Across much of its native range, roadsides are only mowed twice per year: once in late spring, and once again in late fall. The early spring mowing clears away competing plants that could slow the growth of Desmanthus illinoensis, while the late fall mowing breaks up dry seed pods to cause scarification, which improves germination rates. For outdoor cultivation, this species is recommended for USDA hardiness zones 5 through 8. Its seeds have a waxy coat that requires scarification before planting. The root bark of Desmanthus illinoensis contains gramine, a compound that is toxic to some animals.
