Best way to avoid intense squirrel damage is NOT to grow small trees. Grow big bonsai, the thicker bark and bigger trunks aren't as interesting to rodents. You can also encourage predators, like I do. Instead of killing snakes, I ignore them. They are the BEST rodent deterrent out there... This black snake has been around my backyard since he was a pup six or seven years ago.
View attachment 330460