Wild White Indigo is a classic prairie herbaceous shrub reaching about four feet in height that thrives in dry to mesic soils. Greyish to bluish green foliage is topped by tall white flower spikes beginning in June and lasting up to a month. With a long taproot and great longevity in the landscape, plant this and other indigos where they can remain for decades. Some skippers and butterflies use this as a host plant.