Our expert says:
My sympathies.... There are ways to deter cats from your garden, but all involve a bit of effort or expense. The most subtle is to spray all your boundary walls/fences with a solution of citronella oil. You can get this at the chemist and mix a few drops with water in a spray bottle - spray the tops of the walls where the cats come over every day to start off with and, if it works, do it every 3 days and then once a week for a while. The scent is offensive to cats and usually deters them. Other methods involve spraying them with the hose or throwing crackers near them, but this may be a bit difficult in the middle of the night! The only alternative is to put up spikes on your walls (Eina Ivy definitely deters cats) or an electric fence. If you knew all the owners you could ask them to keep their cats inside at night - perhaps write a note to all the neighbours about your problem suggesting this for a couple of months until the habit has broken.
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