Colchicum species and bulbs. Colchicum are a genus of plants from Asia and the Mediterranean. Colchicum send up flowers before foliage, hence the name "naked ladies", however with species and hybrids such as Colchicum Aggrippinum, Colchicum Autumnale Alba and Colchicum Byzantium that will bloom from midsummer through to spring. Colchicum grow best in a humus rich soil in part shade. Colchicum are a a very interesting species, well worth exploring in some depth. Nurseries, Mail Order Nurseries, Specialist Nurseries,Online Nurseries.