Posted: 24/04/2017 at 17:00
Very difficult to stop them. We lost over 3,000 tulip bulbs t them last year. All you can do is find the point of entry and block it off. I have had to put a couple of hundred metres of wire netting fence around the perimeter.
We were told that they would not dig where there were empty (well half full of water to stop them blowing away) clear plastic bottles. Looks a bit odd, but they have not come back in since we put up the fencing and placed the bottles round the base of it.
They are creatures of habit so if you can break the habit of them coming into your garden then the problem may well go away.
Most of the things suggested on the Web are actually illegal so take care.