I've been growing Nerine bowdenii for about 8 years in pots, in Cleveland and now Upstate New York. They are blooming now, will be brought into a sunny window to dry down, then kept cool and dry for the winter rest. In spring, I bring them out with the other summer growing bulbs and let them grow all summer. They've successfully bloomed nearly every year. The increase in the pots has been reasonable, not fast, but steady. Some years, the leave insist on growing before I get them outside. Most of the time, they cooperate, but it took a few years to get them into the cycle of drying down when I wanted them to. Michael Interlaken, NY Z6