Arnold asked, >Is the cartwrightianus also a source of saffron? What is your potting >mixture for these winter flowering crocus? I haven't ever tried harvesting saffron from C. cartwrightianus but I suppose you could -- the styles are just not as long as in C. sativus. I don't particularly like the taste of saffron so don't harvest it often. These crocuses are potted in the same mix I use for almost everything: 2 parts coarse, sharp "upriver" sand, one part ground horticultural (white) pumice, and one part forest humus from my woods. Jane McGary Northwestern Oregon