With rich purple, butterfly-like blossoms that are about 20% larger than is usual for this family, Kashmir Purple has a built-in edge with gardens across the country. Add this plant's tendency to bloom heavily in the early summer, lightly during the hottest months and then again with vigor in the autumn and you have a winner by anyone's standards. Spreads quickly, but not aggressively, to fill in between other plants. Kashmir Purple is a variety that's especially popular in Europe and should be more widely grown here.