Amaryllis belladonna blooming project - year 4

Jim McKenney
Fri, 12 Jun 2015 10:06:28 PDT
The Amaryllis belladonna here, planted in the ground inside a cold frame in 2005, has produced a thick tuft of leaves but has never bloomed. Earlier this year, I forgot to close the cold frame tight  during a freak temperature drop in April and the foliage of the plant, for the first time since it was originally planted, was destroyed above ground. It has since regrown. 
Nhu, you mentioned that early reports seem to suggest that temperature is a triggering factor. Does that mean a trending rise in temperature or a trending drop in temperature or just an increase in fluctuations of temperature? 
Jim McKenneyMontgomery County, Maryland, USA, USDA zone 7, where the first lilies have started. 
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