I have a martha washington geranium that is very dry from the summer heat , do i prune it now ir later n the fall?

sb53
Your location could be of some importance here.

Is it potted? In the ground?

Yes, we really need to know where you are to answer - fill in your profile with your location so that it will come up in all your posts.

Just a zone doesn't help with this question, as your zone only tells us how cold it gets in the winter, on average.