Robust in habit, and thankfully very attractive, Plumbago is a deciduous ground cover about 18" tall, with electric blue flowers that still bloom while the leaves turn deep red—exhilarating! Bloom time is generally July to September. It's perfect for a parking strip where it will be contained, or an area where it can roam and regale you with its color. Plant it with spring bulbs since the leaves come on late. Tolerates clay!
Minimum temperature: -20° F