Quote Originally Posted by tacman7
What do you do to prevent that?

It's probably here somewhere. I did some searching. Stress?
There are many factors that can cause a plant to hermie. Stress, environment, PH levels, too hot, too cold, light, lack-of or too much nutes, and many others. You have to pay attention to your plant. As funny as it sounds, it will let you know if something is wrong.