USDA Hardiness Zones
2 - 8
July - October
Large, purple, thistle flowers, up to 2 inches across.
Full sun; moist, well drained soils.
Found in fields and prairies. Short lived perennial that readily re-seeds. Eastern Goldfinches eat the seeds and use the tufts of hair from seeds to line their nests. Considered a primary noxious weed in Iowa.