Voles can be just as damaging to woody shrubs and trees as tender perennials and annuals.

Some locations simply harbor more of these rodents than other areas. Development has a lot to do with it, loss of natural predators, etc.

I wish I had a simple solution for you, believe me. Have you talked this over with your local extension office? Sometimes, they have some good ideas.

We use hardware cloth as a barrier around our roses. They especially hurt the young rose, so the barrier has really helped. We are adding some perennials, and I don't know about them yet.

I don't want to put out poison because it can hurt dogs and cats. THere is a creek behind our house so they will keep coming. The hardware cloth has been our best answer.

Good luck.
Let me know if you would like to know how to use it.
If you have never heard of it before, it is like real strong chicken wire.

Sammy

Sammy, what size and mesh hardware cloth did you use? They've bitten through mine, which is ¼" mesh. I can get some heavier-duty through industrial suppliers but don't want to spin my wheels.