We've used a plastic mesh around the trees that "buttons" up from Forestry Suppliers. Am trying to switch over to a cheaper, easier to install snap-together unit for the new trees, but I will not WILL NOT skip the 3-4" of gravel we drop at the base of the trunk, embedding the tree guard and then spread out at least 2' in diameter. Yes it's an import, yes, I pay $200 a truckload for
pea gravel. Two Novembers ago my cat killed eleven
voles in our 1 acre orchard in 48 hours. So far no trees have been girdled, knock on healthy applewood. I don't have
enough cats to park in the new orchard. I'm buying more gravel.