Categories Bulbs & Tubers | Perennials | red & pink flowers | Colchicum autumnale “Pleniflorum” Colchicum autumnale “Pleniflorum” Common name(s): Autumn Crocus, Meadow Saffron Synonyme(s): N/A Family: Colchicaceae Origin: double flowering cultivar of the European Autumn Crocus. More infos: the genera Colchicum and Crocus are not related. USDA zone 5. The leaves of Colchicum autumnale and C. speciosum appear in spring. Related plants:Colchicum autumnale Colchicum autumnale “Album” Colchicum bulbocodium Sandersonia aurantiaca