Agastache rupestris (Sunset Hyssop) is an upright perennial boasting showy spikes of tubular salmon-orange flowers with purplish calyxes from early to late summer. Eye-popping, they are borne above the foliage of silvery-green, narrow leaves. Providing an outstanding garden performance, Agastache rupestris adds color as well as a lovely spiky texture to the garden.