9 easy summer flowers These garden beauties thrive in summer heat and bloom nearly nonstop into fall Aster 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). Pinterest Gloriosa daisy (Rudbeckia hirta) Deep golden petals radiate from chocolate centers on 2- to 4-inch-wide flowers. Plants reach 3 to 4 feet tall and 1 ½ feet wide. Shorter varieties such as ‘Goldilocks’ and ‘Toto’ top out at 10 inches tall. Coreopsis (C. grandiflora) Fluffy, golden yellow blooms atop tall stems. 'Sunray' is a dense, compact selection with double and semidouble flowers. Zones 2-24, H1, H2. Dahlia Bold blooms in a range of vibrant colors grow from tuberous roots. We planted pink and coral decorative dahlias and a red-and-yellow, cactus-flowered variety. Provide light shade in hot areas. Zones 1-24. Purple coneflower (Echinacea purpurea) Daisy flowers of rosy purple with knobby orange-brown centers, which resemble small beehives, atop clumps of bristly oblong leaves. Grows to 4 feet tall. Zones A2, A3, 1-24. Gaura (G. lindheimeri) White flowers cluster like butterflies atop tall spikes on these airy 2½- to 4-foot-tall plants. Selected forms include 'Siskiyou Pink' (to 2 feet tall), with rose-pink flowers and 'Whirling Butterflies' (to 3 feet tall), with white flowers. Purple fountain grass (Pennisetum setaceum 'Rubrum') Feathery, rose-colored plumes fade to beige atop clumps of reddish brown foliage. Grown as an annual in cold climates, it is especially pretty beside gloriosa daisies or purple coneflower. Zones 8-24. 'Moonshine' yarrow (Achillea) One of the most carefree and generous bloomers, yarrow has tight clusters of deep yellow flowers on 2-foot tall plants. Pair it with blue flowered catmint. Penstemon (P. gloxinioides) These bushy plants are fairly short lived, but to make up for it, they produce lots of trumpet-shaped blooms over a long period. Deep purple ‘Midnight’ and scarlet ‘Firebird’ are standouts for their vivid, south-of-the-border colors. Pink and white ‘Appleblossom’ looks fresh and springlike.