Does anyone else have problems with their gardeners inadvertently cutting their electrical wires? My home was landscaped 20 years ago with electrical wires all over the yard to support lamposts, speakers, etc. Nearly all of them have been cut over the years from gardeners using their equipment to trim hedges, etc. Any solution to this problem?

The only complete solution is to put all of the wires in rigid conduit. Obviously that isn't a simple retrofit, but it is unlikely that anything short of that will help all that much.