Hi, I don't think anyone has answered Alberto about the hardiness of these bulbs. I only grow Phaedranassa and understood it was not very hardy and grow it in my greenhouse which we do not heat unless we have an unusually cold night. A friend had Phaedranassa planted in her garden in Santa Cruz, California and I remember wondering when I saw it if that was wise. She lost it the next year when it got colder than usual. I don't know the exact temperature was in her garden so can't convert it to metric, but I believe it was in the low twenties (F.) Mary Sue Mary Sue Ittner California's North Coast Wet mild winters with occasional frost Dry mild summers