How do I keep the coons and opossums from digging up my flowers?

Last year I planted several phlox down at the end of my lane and I only have one left. They were all dug up and roots eaten. I tried barricading them off with chicken wire and they dug under it and crawled up and over it. I trapped several coons in live traps. They just recently have dug up the same "empty" spots again!!! Is there anything I can spray on the area to keep them away? I would like to try to replant some again, but not if I can't keep them away!
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