For Hans and others finding this bulb tricky. When I was a kid in Berkeley, Calilfornia, this was (and still is) a common plant, thriving on neglect in clay soil, increasing and blooming every year. Temperature maxima and minima there in the Bay Area over the last 60 years are about 26° F and 99° with freezing temperatures rarely continuing for more than one night, and maxima for not more than 2-3 days at a time. The soil can bake hard as a rock and crack wide open in the summer. Bulbs are often partly out of the ground--as much as a third of the length of the bulb.