The one I let grow was cut several times early-on with the lawnmower and it's much fuller than usual, so I'd say yes. If you don't take it back to a terminal growth point each time you might get smaller and more numerous flowers. I'm not a good plant pincher. Normally, mine have to be grazed by something, broken by wind or whacked by mistake to get "pinched".
Here's that light blue one I mentioned in a previous post.
