Starter Plant from Dianthus Supra Purple. A dwarf hardy dianthus that flowers slightly earlier than dwarf annual types. Plant breeders crossed Sweet William with annual dianthus to produce a species that had larger self cleaning flowers, more free flowering and better garden performance during summer heat. The 1 ? inch single purple flowers are lacy, with highly fringed petal edges. Can be cut for fresh arrangements or enjoyed in the garden during the long flowering period. Zones 6-9