Each year I plant lots of Fiesta Del Sol and Zinnia mix. The Japaneses beetles mostly spend their time on those plants and ignore the others. Interesting thing is, that I never notice any real damage on the flowering plants. So my advice is to plant some decoy plants that are very attractive to the Japanese beetles.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.