Our laurel hedge was alive with wasps every summer, and then I discovered the waspinator. The wasps certainly came, and they left just as quickly and didn't return. It certainly worked for us, so it might be worth a try. If you google waspinator, you'll find all the information - just put it out before the wasps usually arrive and fill it with thin bin bags, I wouldn't bother with a balloon, it just deflates in no time. Hope it works for you if you get one. I've also found that it needs to be fairly visible to the wasps - don't let too much foliage obscure it.
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Our laurel hedge was alive with wasps every summer, and then I discovered the waspinator. The wasps certainly came, and they left just as quickly and didn't return. It certainly worked for us, so it might be worth a try. If you google waspinator, you'll find all the information - just put it out before the wasps usually arrive and fill it with thin bin bags, I wouldn't bother with a balloon, it just deflates in no time. Hope it works for you if you get one. I've also found that it needs to be fairly visible to the wasps - don't let too much foliage obscure it.