Mary Sue asked, >Perhaps Jane should tell us which ones she finds in Oregon do well for her. >I am sure that all species are not alike. I have Habranthus tubispathus, which seeds around into other pots and is hardy in the bulb frame but not in the open; H. robustus, which did well in the frost-free greenhouse but died in a patio planter over the winter (it survived a warm winter in the open garden, but not a cold one); Zephyranthes candida, frost-free; and a small light pink Zephyranthes that I have not identified, frost-free. My mother's former garden in the Central Valley of California, where winter lows regularly hit the low 20's F, was overrun with H. robustus and Babianas. I could probably grow H. tubispathus in the open garden were it not for the extremely wet winters here. It seems to survive whatever water regime it gets in the pots it invades, just like that other invasive seeder, Anomatheca (now Freesia?) laxa. As for what triggers fall bloom, my intuitive thought from observing them over the years is that Mediterranean bulbs respond to temperature changes more than anything else, but that would probably not be true of subtropical and tropical bulbs. With Colchicum, obviously, it is not moisture, since they are all too ready to flower in bags! Crocuses will, too. Anyway, my "rain lilies" are not getting hot nights, wherever they are (either on my deck or in the bulb frame, in summer), because at this elevation night temperatures almost always drop into the low 50s F., even after daytimes in the 90s. Jane McGary NW Oregon, USA