Plants That Repel Japanese Beetles

Instead of having to rely on pesticides to repel Japanese beetles and other pests, gardeners can use a technique called "companion planting." The tactic involves planting nearby species that naturally repel unwanted insects.

Threatened Plants

Gardeners who wish to benefit from companion planting must know which of their plants face the greatest threat from Japanese beetles. According to the University of Maryland Extension, these insects feed on more than 300 species but favor roses, grapes, fruit trees, Japanese and Norwegian maples, hibiscus and crab apples.

Repellent Species

Garden plants that repel Japanese beetles include tansy, rue, garlic and catnip. The Home and Garden website recommends planting tansy near roses, raspberries and fruit trees to protect them.

Toxic Species

Some plants, instead of repelling pests, actually attract and then kill them. Larkspur and four-o-clocks, for instance, both attract Japanese beetles but also contain substances toxic to them, according to the Home and Garden site. Gardeners should note that both of these plants can also poison humans.

References

• University of Maryland Extension: Japanese Beetles
• Home and Garden Site: Companion Planting