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How can I discourage cats?

The best method is simply to keep your soil covered with plants, as cats are looking for bare soil. Open soil should be filled up by pushing rose and other prickly prunings into it, or laying chicken wire just under the soil surface. Use twiggy sticks by pushing them in at an angle to protect new sowings and plantings.

Another good method is to keep the soil moist - they don't like it.

If all else fails, put a nice tray of cat litter in a hidden corner of the garden and empty it into a hole under a fruit tree every so often. They're so lazy they'll always use that.