Before I start moaning about just how much I am hating cats right now I had better say that in my lifetime I have been the owner of five cats - at one time I had two at the same time......so I quite understand the 'passion' for them as pets.
Maybe my current situation is karma/payback for all the poo my cats must have deposited on other people's gardens over the years!
Whatever, my garden is a cat's toilet at the front and at the back, in the beds and on the lawn. There isn't a single day where I am not left a little (or large!) present; some days more than one. I am fairly sure it came about because until last winter we used to spend half a year in the States and the cats had free rein. I am trying to believe that the quantity is reducing by degrees as they get used to the fact we are in full time residence.
I have tried just about every suggestion under the sun that is practicable, with no success whatsoever. Indeed they were the reason for my giving up trying to grow edibles in the back garden a few years ago.
In a last desperate effort we are currently trying two of these.......
They are solar powered sonic cat (and dog) repellers. They emit a high pitch sound which is uncomfortable for cats and dogs but humans can't hear. There is a suggestion that children might be able to hear it. I certainly can't. They have a 70 degree spread with a twenty foot (plus) reach. As our front garden seems to be the worst hit we are using them out there right now. It has proved difficult on our corner plot to site them so they form a barrier across the garden. Think we've cracked it. They have a couple of small flickering lights which flick on when something comes within its range so it is easy to check they are still working. We have no means of hard wiring them so they rely on recharged batteries.
Sadly our front garden is mostly in the shade (NE facing) so the solar element doesn't work at all. We also have a lot of foot and car passing traffic so the batteries run down very quickly. [The photo above was taken in sunlight in the back garden]
For us this means they are a bit of a pain as we have to keep an eye on them almost daily to check they are still working and then charge the batteries when they are not - so, for us, they don't seem a good long term solution.
Amazingly we have only had one deposit since they went in so I am fairly confident they are working. I am living in hopes that the eight cats - really! - who use our garden may get in the habit of going elsewhere - huge apologies to anyone who inherits them.