Twilight Rose TreeA Profusion of Velvet Purple Roses Why Twilight Rose Trees? Bring a touch of mystique to your landscape with rich amethyst Twilight Roses. Each spring, old fashioned double form flowers emerge in clusters with huge 4 to 5 inch blooms set against dark green leaves. The velvety blooms are touched with a wispy smoke appearance. It blooms on new wood and is a repeat bloomer. Youll have a continuous array of large purple flowers spring, summer and fall.