Yes, Polly, Daffs can protect Lilies, somewhat, but I found the voles still found the Lilies and only a few were left.
Plants will only be a mild deterrent, and when the cold winter comes and voles are hungry enough, they find food to survive.
And, unfortunately, the voles multiply exponentially.
I know alot of folks don't like to use bait., until the destruction leaves no alternative.