Ace hardware sells a non-toxic spray (I believe the active ingredient is mint oil). Sorry I don’t have any other ideas. I came accross this nice article in the Washington Post this week about why Yellow Jackets become so aggressive this time of year. (click on the third week of September to find the yellow jacket story.)
Please let us know what you end up doing and how it works!
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.