Dark green foliage and long, deep purple stems set off the luminous, pinky lilac blossoms standing above them. 'Karma Prospero' has beautifully formed, 5in blossoms that embellish a border all season, and each flower will last about 10 days in arrangements. Decorative form. PP 16,962
These hybrids of species native from Mexico to Colombia hold their display in reserve for mid- to late summer and early fall, when most gardens and most vases are looking a little tired. Planted in 3s and 6s, Dahlias serve to fill holes that develop in the perennial border and make excellent potted plants (1 tuber in a 12in pot). They prefer full sun, though partial shade is acceptable, and they like rich soil and even moisture. Dahlias are perennial in Zones 8-10. Where they are not hardy, Dahlias are easily overwintered indoors (click on "Growing Guide & Tips").