Amaryllis that bloomed last winter indoors spend summer in a small cold frame in the backyard, recharging their batteries for this winter's bloom. Sometime in September or October, the green growth will die back; that's their way of saying that they're ready for dormancy. I'll withhold water, cut back the leaves to the bulbs, put the pots in the garage and let them go absolutely dry. Sometime in November-December, they come out again, get watered, go under grow lights, and the process starts again. Miraculous!