A reader who tried many other methods has concluded coarse sand is the best slug deterrent.
Sand (especially coarse sand) works better than anything else I’ve tried in my garden as a slug deterrent. Just sprinkle the sand around the plants you want to protect. I don’t like using wood ashes because they can change soil chemistry — plus, many people may not have wood ashes available. And I find beer traps to be awful to clean up.
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