Among the most outstanding plants for the late-summer and fall garden is Calamintha nepeta. Its 18" stems present a cloud of dainty, very light blue flowers that start blooming in August and continue without pause until frost, sometimes past. The leaves are a soft mid-green that always looks fresh. When crushed, they give off a rush of tart, minty fragrance that works like smelling salts on a hot day. For that reason alone, Calamintha is a fine choice for the front of borders, where a pinch is always at hand.
This amazing plant thrives in any well-drained, sunny location and shrugs off heat and drought.