Digitalis obscura is a little different from most foxgloves I've encountered: It has willow-like leaves and, unlike its shade-loving relatives, it prefers sun. It is a short-lived perennial, but it will self-seed, so keep that in mind when dead-heading. Deadheading will prolong the blooming period, but stop and some point to have seeds. This rusty-colored foxglove is heat and drought tolerant in Zones (4B) 5-9. Quarts. (Illustrtion from Curtis Botanical Magazine by John Sims 1749-1831).