With periwinkle-blue flower spikes all summer amongst a fragrant cloud of gray-green foliage, ‘Walker’s Low’ will attract both hummingbirds and butterflies. It will cascade beautifully over an edge, be it a wall or pot, function as a taller ground cover or try it in a mass planting for a billowy effect. It’s most content with regular watering especially in summer, but with age can become fairly drought-tolerant. 2.5 T x 3′ W

Minimum temperature: -20F