Unlike many Crocus, a cold winter is not required for Crocus sativus to flower and be perennial. See this reference's abstract: http://www.actahort.org/books/650/650_2.htm The abstract says more cold is required to initiate bloom than to form the blooms in the corms. And even that "cold" is only 17 C, or 63 F, hardly what I would call "cold". They grew fine in my garden until critters ate them. I have always been fascinated how long their leaves grow. - Gastil Santa Barbara, California Approximately USDA zone 9b or 10a