Which is it moles or voles? Moles you have to trap out. Voles you have to poison out.
A mole is a almost blind critter with big paddle like front feet.
A vole is a small mouse like critter with a shorter tail than a mouse. WE had to geta pesticide license to buy poison oats and put them in a special T shaped feeder we made out of PVC. google on which ever your refering to and you find some info on how to try to control them.
I say "try" because voles population builds up and then crashes rather dramatically. So you might be able to protect plants around your house with poison but you, the hawks, the coyotes, the cats, the dogs, sea gulls and all the predators will not put a dent in their population when it builds up.
I've seen sea gulls eat so many they couldn't fly. There were piles of owl pellets on all my fence posts and the hawks were working overtime and it didn't dent their population. In a matter of a few months, the succumbed to some type of epidemic and they were just gone. they are just now starting to come back after a 4 year hiatus.