Amorpha canescens

Amorpha canescens, commonly called lead plant, is a Missouri native that typically occurs in open woodlands, glades and prairies. This pea/bean family member is a deciduous shrub-like perennial featuring long, slender, spike-like clusters of tiny, bluish-purple flowers. Blooms June-September. 

Amorpha is a legume–a plant that increases nitrogen in the soil--and has a very deep tap root which enables the plant to survive prairie fires and drought.

Very tough and drought tolerant!