12 Saffron Corms Largest Available - 10+cm - Crocus Sativus - Grow Your Own Saffron Spice and Beautiful Flowers Each Saffron Crocus Flower produces 3 stigmas per corm. These "Mother" corms are larger than the largest corm shown in the second photo. Photo is my Saffron Corms planted in September 2015, blooming November, 2015. Perennial. Allow to dry out when dormant over the summer although they will take some summer water. A friend in Maine says they bloom with the first snow. Sold by Marde Ross & Company, a Licensed California Nursery since 1985.