Shop for Outdoors at The Home Depot. Encore Azalea is the world's best-selling multi-season blooming azalea. Encore Azalea bloom during 3 seasons of the year - spring, summer and fall. One of the newest introductions into the Encore Azalea line, Autumn Angel has pure white flowers that appear iridescent in the morning light. The combination of the stark white blooms and the glossy, deep green foliage makes this variety a wonderful addition to any garden.