Salvia longispicata x farinacea 'Indigo Spires'
They are 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 are large (did we mention it grows big?). Trim back by a third in warm weather; deadheading the flower stalks encourages fresh blooms. This sage is believed to have originated as a garden hybrid between mealy blue sage (Salvia farinacea) and Salvia longispicata.
Deadhead to keep it in perpetual bloom during summer. Foliage can be freely cut back by a third. Cut it back in winter after freeze damage.
Light: Full Sun, Part Shade
Zone: 7, 8, 9, 10