I have moles in the garden and I can't seem to get them out. There are only a couple and they don't seem be doing much in the way of damage, that may be because I smash down the runs and mounds everyday. I set up a trap to get rid of them but they travel around so much that the run I put it on seems to never get used a second time. Recently one has been very active in my greenhouse. I have tried the pellets and tried flooding them out but to no avail. Any inexpensive non toxic methods?