This member of the "Bishop" dahlia series boasts the same wonderful dark-purple foliage, topped with 3' tall spikes of 2" dark, fluorescent wine-purple flowers. We tried to find an RHS color code, but this is obviously a new color for the RHS unless they are boycotting fluorescent purple. This plant is also unique since there is no such thing as a Bishop of Canterbury. There is an Archbishop of Canterbury, but that's several pay grades higher. For us, Dahlia 'Bishop of Canterbury' flowers from June until frost...perfect for a touch of purple in the border...a hummingbird treat.