I have 3 raised beds. I used the free mulch from the city to supplement the soil. Well- you get what you pay for: free mulch comes infested with free grubs. And, apparently, raccoons find them to be a yummy treat. I chased 4 juveniles out at 3am. I got some beneficial nematodes and am now starting to dig up dead or dying grubs, but the raccoons are still tearing up the beds. any suggestions?