voles or moles?

[Brian Williams]

I am growing a hand full of Arisaema here in Louisville KY. We own a
large landscape nursery and just expanded around 5 acres. In the far
areas of our new land is a valley like area leading to a creek in a
forested area. I recently planted many species of Ariseama out and have
found that something seems to be eating them now. It looks to me to be
moles but a friend has called them voles? Is their a way to rid my self
of this destructive monster or will I have to relocate the whole group
to a better area? Will casto beans rid me of them or yuccas? I have
heard they could help prevent them. Any good ideas would be appreciated.
THANKS