Perennial and hardy to zone 4
Plants grow to 1-3 feet tall
Bright purple blossoms mid-summer through fall
Grows well on most soils
Fixes nitrogen in the soil for increased fertility
(Dalea purpurea) Bright purple blossoms mid-summer through fall. Stunning when planted with Butterflyweed, Black-Eyed Susan, and any of the shorter prairie grasses. An important prairie legume that fixes nitrogen in the soil. Grows 1-3′ tall on most well-drained soils ranging from dry sand to clay. Perennial. Hardy to zone 4.