summer blooming Bluebeard Shrub
summer blooming Hydrangea paniculata
Lamium -- full shade! Lamium is an excellent, easy-care groundcover. Most types bloom through the summer, producing clusters of pink or white flowers. Even when they're not blooming, they have great silver-marked foliage that brightens up shady corners. What a beautiful alternative to a struggling lawn! Name: Lamium maculatum Growing Conditions: Full shade and moist, well-drained soil Size: 8 inches tall Zones: 4-8
Fern-Leaf Bleeding Heart (Dicentra eximia and D. formosa) look beautiful all season. They'll bloom on and off from spring to fall (if they get enough moisture during hot, dry periods), producing delicate clusters of pink, red, or white flowers. Even when not in bloom, though, their tidy mounds of blue-green, ferny foliage looks great. Top Picks: 'Bacchanal' offers dark red flowers; 'King of Hearts' offers rose-pink flowers and stays about 1 foot tall; 'Aurora' offers white blooms.
Yellow Corydalis - longest blooming shade perennial