Salvia plants are those go-to plants every garden should include: an extravagance of beautiful colour in exchange for some sun and a little water! Indigo Girl boasts the darkest colour of the Color Spires series, with masses of spikes of dark indigo-blue aromatic flowers on strong stems above dense and well-branched mounds of foliage. Plant in groupings for the most dramatic effect. Blooms appear from late spring to early summer, and deadheading will encourage late-season additions. Container planting is also an option. Flowers attract bees, butterflies and hummingbirds.