Is your plant Geranium pratense or the hybrid 'Orion'? 'Orion' is a seedling of 'Brookside' which is 50% G. pratense. So 'Orion' has some G. pratense blood, but shouldn't be called by the species name. Just FYI. Don't mean to be nitpicky, LOL!

In any case, regardless of what your geranium is, you can feel to free to whack it down at any time without fear of harming your plants. You can selectively prune out the old growths or you can just take shears and cut off all stems close to the ground. Within a few weeks, your plants will have regrown into nice, compact clumps of foliage and might produce a few flowers stems here and here through autumn.

Ispahan, thank you very much for the response. I am not really sure what it is then...haha. The tag said Geranium Pratense with the quotations "Orion."

That is exactly what I wanted to know. I wanted to make sure before I went hacking away. Thank you again very much for the information.