Summer Wedding Bouquets

I'm helping my sister organize her wedding and she becomes stressed that most flowers will not last all day in the heat of summer in Hong Kong. Any suggestions on the type of flowers are good and the means to keep the bouquet fresh during the day?

Thank you!

ROSE ....

She should call some florists in Hong Kong and ask them. I found these flowers growing in Hong Kong:

http://en.wikipedia.org/wiki/Bauhinia_bl ...