Giant Colchicum Fall Crocus: Very large pinkish lavender flowers, which are white at the base! . Like all Colchicums, 'The Giant' is not favored by deer. Fall blooming colchicum are wonderful additions to autumn gardens. Blooms form chalice-shaped cups. Leaves turn golden yellow as they mature, blending with foliage. Bulbs will flower on your window sill even if not planted. Mature Height: 8-12"