New from Proven Winners ColorChoice in 2012: Bloom-A-Thon series of reblooming Azaleas. Large flowers appear in April, and then rebloom in early July, continuing through fall until hard frost. There are four Bloom-A-Thon varieties with blossom colors of white, red, pink and dark lavender. Although there are some significant differences among the four, they share the remarkable characteristics of heavy blooming for four to six weeks in April and May, then a second equally heavy blooming period for 12 to 14 weeks starting in late July.