‘Autumn Ruby’ Encore azalea in April 2009 Photo credit: Dr. Alan Windham, Extension Plant Pathologist, University of Tennessee Encore Azaleas™ bloom twice: in the spring and from late summer into the fall season.Ten varieties consistently exhibited cold hardiness throughout zones 6-a and 6-b: Autumn Amethyst, Autumn Carnation, Autumn Cheer, Autumn Lilac, Autumn Royalty, Autumn Ruby, […]