When we lived in Wilton, Connecticut about 2 decades ago I grew and flowered Amaryllis belladonna. It was planted under the rather wide roof eaves close to the wall of the house. Flowered each year. Moved to New Jersey, brought it with us. (Mind you, the first several wardrobe cartons off the moving truck had shrubs, and I'd spent the whole summer moving "community pots" - large black two-handled nursery tubs with a small shrub, perennials, ground cover, and bulbs all in a "happy family planting.") Anyhow, even though New Jersey is south of Connecticut it also has clay soil and not the divine, high organic, moist but well-drained soil, the holy grail of gardeners, that I had in Wilton. So yes, I successfully grew Amaryllis belladonna on the east coast. But I think it was more the site than my expertise as a gardener. Sigh. Judy in hot and humid New Jersey where last night's electrical storm dumped 1.3 inches of rain and given us steam bath conditions