Few plants can brighten a tired corner like these tough perennials. They thrive through summer and bloom nearly nonstop into fall if you keep the spent flowers picked. Full article
Starting in June, you'll find the plants at nurseries, usually in 1-gallon cans (though the best selection of dahlias is available in spring, when you can plant them from tubers).
Aster
These daisylike flowers are available in lavender, pink, or white. Three varieties we like: A. cordifolius 'Cape Cod' (Sunset climate zones 1-10, 14-21), A. c. 'Little Carlow' (zones 1-10, 14-21), and A. novi-belgii 'Melody' (zones 1-24).