5 Clumps of Saffron Crocus - Crocus Sativus Corms 5 Clumps Fresh Corms - Approx. 20+ Bulbs Various Sizes up to 9 cm. Late Fall blooming. Perennial. Plant Clump May-Sept. and start watering in September after Dormancy. Leave undisturbed for at least 3 years to increase in size and number of corms. Harvest the purple flowers in the a.m. Remove and Dry the Orange Stigmas (3 Saffron Threads per Flower). Sold by Marde Ross & Company, a Licensed California Nursery since 1985.