Dyfed,
United Kingdom 
my begonias have a lot of leaves but not much flowers
21 Aug, 2010
Answers
I would also make sure they were getting enough light. Begonias can bloom in bright shade, but in deep shade its a no go.
21 Aug, 2010
Either they're not getting enough sun, or you've fed them wrongly. They should have had something like tomato food to get flowers...some feeds give lush leaves at the expense of flowers.
21 Aug, 2010