Nothing. Let them flower. That is only a sign that everything is ok. Depending on the variety you've bought will determine the time of harvest with relation to the flowering period. First early, second early, or main crop. For example first earlies (which are panted from mid feb onwards) are pretty much ready when The flowers have dropped. With second earlies and main crop, I'd wait for the foliage to go yellow and die back before I'd harvest those pots. If the flowers get pollinated, they will produce small tomato like fruits. Do not eat them as they are poisonous.
Answered on July 10, 2011
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