Sun or partial sun. A sprawling perennial salvia, freezing to the ground in winter. Spikes of deep purple blooms thrive during the hottest months, attracting hummingbirds and butterflies.Indigo spires is large (did we mention it grows big?) To keep it tidy, trimming back freely in warm weather to relieve stress; deadheading encourages fresh blooms.This sage is believed to have originated as a garden hybrid between mealy blue sage (Salvia farinacea) and Salvia longispicata.