Crocus sativus (Saffron Crocus) blooms in autumn with lovely lilac petals enclosing three deep orange-red stigmas per flower. These are the source of what we know of as saffron, the world’s most expensive spice. Not only are these lovely crocuses a source of visual candy in the fall, but you can harvest the spice yourself and enjoy them in recipes throughout the year. Plant your saffron Crocus bulbs as soon as they arrive in late summer. They will sprout and grow in about 6-10 weeks (sometimes in as little as 4-6 weeks), putting on a colorful fall display. If there is danger of frost in your area, plant in containers that can be brought indoors.