Answer: If voles are damaging your hostas, they will damage anything else you plant in the area. Since your landscaping is already being damaged by voles, you need to consider vole eradication. Voles can be removed humanely from a yard by using Havahart live-traps, exterminated by using mouse traps or poisons, frustrated by garden fencing, or driven away with vole repellents.
Good luck with your garden!
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