Bloom-A-Thon azaleas are shade tolerant reblooming azaleas with intense color, neat habit, and 20+ weeks of bloom. These azaleas begin blooming in spring, along with other azaleas. After a brief rest to put on new growth, they begin flowering again and continue through frost. Bloom-A-Thon azaleas do best in a lightly shaded location; Hardy to USDA zone 6b, heat tolerant to AHS zone 9.