Intense, dark purple flower spikes top gray-green foliage during summer. A great, unique color addition to any landscape. Blooms late Spring to late Summer. Attracts butterflies and hummingbirds. Has great cold hardiness and tolerance of heavy clay soils. They do best with full sun and will grow to be 18-36" in height with a 24" spread. They require little watering once they are established. Grow best in zones 4-10. Make sure to deadhead for an extended bloom time