Answer: First of all, you can loosen clay soil by incorporating organic matter whenever you can. (Add leaves, grass clippings, and/or compost when you till.) Or you might consider building raised beds and bringing in some better topsoil. Ants and slugs can be deterred -- though not completely eradicated -- using diatomaceous earth. This is a fine powder composed of tiny fossilized marine animals which irritates the pests. Sprinkle it regularly (especially after a rain) around the perimeter of your garden,or underneath each plant. Diatomaceous earth is harmless to mammals.
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