I assume your planting a fruit tree. The voles are enemy #1 I wrap alluminum screen around the bottom of the tree & staple it into a tube shape , then burry it 1-2" deep. the vole stopper. after that 15'long length of 6' high 1x2 turkey wire, rolled & staked down. The only thing that hurt me was the helicopter was so low this year they blew the fencing over, (seismic testing copters) My 6 year old trees are ready to have the fencing removed, then I'll just protect from deer rubbing. and voles, I have seen voles chew trees as big as a quart of beer. can you Imagine losing a tree to voles after 10-12 years.