Answer: There aren't too many options when dealing with moles. An underground barrier placed all around your yard might keep them out, but now that they're there, you may just have to wait them out. Eventually they'll pick up and go elsewhere. Sometimes Euphorbia (also sold as gopher plant) will act as a deterrent. Aside from these suggestions, well-placed mole traps will eliminate the moles, but that's not exactly what you want to do. I'd just wait them out. They'll move on to greener pastures (just as they managed to move into your yard).
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