They have eaten many exiting lilies here also, lilies I can't replace.
A few years ago I rebuild one of the beds I grow my lilies, in this one I also grow some martagons. The rebuilding was done in the fall. When the spring come I could see that voles had been there and no martagons come up that year, I think. I also had planted L. hansonii that fall that was given to me. But the year after most of the lilies come up but most of common martagon only few. But the next years many small martagons germinated where there had never been martagons before. A friend of mine told me that it was the voles that had spread the martagon. It's only sad that it's the common martagon and not Cattaniae that I lost. Here are the martagons the voles planted for me.