Question
We have a very large bougainvillea that has been full of flowers all winter, suddenly the blossoms are turning brown we are not sure what is happening or what to do?

Answer
I am so sorry I do not know much about this plant.  Here is what I found on the web.  I hope it helps you a little bit.

http://aggie-horticulture.tamu.edu/plantanswers/publications/bougainvillea.html

http://www.bonsai-bci.com/species/bougainvillea.html
http://en.wikipedia.org/wiki/Bougainvillea
http://www.botany.com/bougainvillea.htm

Kristina
Happy Growing!