By George I think I've got it!
While I distracted Gunther with a ball and baby pool I figured out some Gunther-proof methods. He can no longer dig my flowers or get into the birdbath at his will. I'm sure he'll still eat some of the flowers he can reach, but maybe not since they smell perfume like and not like dirt.
Side note, his vet appointment is tomorrow. Been keeping the wound clean and putting coconut oil on it, which is not easy since he also eats the coconut oil.
Hail Gunther 7-2-2013
If at first you don't succeed, destroy all evidence that you ever tried.