Answer: Is it at all possible that your greenhouse is warm and very humid -- enough to keep them from going dormant? They usually wither if kept both dry and cool, say about 50 degrees. However, there are a few varieties of amaryllis which seem to be evergreen. As long as they have rested, I would try putting them back into active growth and see if they will bloom. If the leaves are healthy I wouldn't remove them. Good luck with them!
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