Why are my bougainvilleas losing their leaves?

I have a few bougainvillea's, planted at different times within different locations, and they are all losing their leaves. Why is this?
I live contained by S. Florida where it is pretty hot, but bougainvillea's close to the heat. It have been raining deeply lately and I know they do not like like mad of water, but i wouldn't devise that would make them lose their leaves. I also know that if you put them surrounded by shock, they will usually bloom.
Why are they losing their leaves and how can I make them regain them and also bloom?


Answers:    I don't know just about bougainvilleas specifically. However, all plants hold a natural cycle. Could it, maybe, be because it is approaching the end of summer?
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