When to trim back shrubs

I have a rose of sharon. This is the third year with them. This year was the best they bloomed. I was told you should trim them back to help them bloom better. I know nothing about plants. When do I trim? Also I have a lilac brush that looks like it tries to bloom and then immediately the flowering parts turns black like it was burnt. When do I trim it to help it bloom better. I don't know what kind of lilac brush I have. All I want is the one that grows the big purple flowers and smells great!!
Submitted by BHGPhotoContest

Hi,

Thanks for writing. The general rule is that early summer is the best time to prune spring-blooming shrubs and winter or early spring is the best time to prune summer-blooming shrubs.

Learn more with our BHG.com pruning guide! http://www.bhg.com/gardening/trees-shrubs-vines/care/what-to-prune-when/


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