Rose verbena forms a cascading groundcover that spruces up a slope with season-long bloom. It flowers best in the cooler weather of spring and fall, but it is seldom without some splashes of color.
The orange tubular flowers of Commotion Tizzy blanket flower give the impression of exploding fireworks. This sizzling sun-lover blooms all season, especially if spent flowers are removed.
Most hydrangeasbloom once and are done for the season. But 'Endless Summer' bears blossoms on new growth -- so you can enjoy the flowers several times each summer. For gardeners in cold climates where winter damage prevents other hydrangeas from flowering, 'Endless Summer' ensures a spectacular show.
An unsung hero of the perennialgarden, speedwell comes in a variety of shades of blue, pink, or white. All produce upright flower spikes on mounded plants. After the first set of blooms begins to fade, shear the plant to encourage branching and rebloom. This combination of spike speedwell, Knock Out rose, and Six Hills Giant catmint creates a spectacular season-long show.
Images and text courtesy of Better Gardens: http://www.bhg.com/gardening