There is nothing worse than being unable to enjoy your garden because of wasps. You can remove wasps from your garden by finding the nest and placing wasp powder around the entrance, but you must do this when it’s dark to avoid being attacked. If you can’t get wasp dust use ant dust as it’s the same thing, active ingredients being Permethrin.
If you can’t find the nest you can set up a bait station, with a plastic drink bottle. Cut a hole in the side of the bottle, so wasps can get in, place a small amount of meat, dog food or cat food in the bottle then add Ant rid (borax). The wasp will take some meat and ant rid back to the nest to share and kill the wasps.