Each Saffron Crocus produces 3 stigmas per corm. The Corms usually bloom in the Late Fall and must be allowed to dry out over the summer. They will form clumps and should be left undisturbed.. Then, like many bulbs, they will grow again when the rains begin. Perennial. Plant 3" Deep. Blooms in Fall but Plant Anytime. Withhold Water in Summer after Bloom and when Growth dies Back.