Companion Plants That Naturally Repel Garden Pests

Overview

Insect damage can ruin a season’s work. Instead of reaching for sprays, interplant herbs and flowers that deter pests or attract beneficial predators. This ecological approach builds a resilient, balanced garden.

Radish

Repels striped cucumber beetles and root‑knot nematodes. Interplant among cucurbits and tomatoes.

Nasturtium

Discourages Colorado potato beetles. Plant near potatoes, tomatoes, eggplants.

Marigold (Tagetes)

Repels Colorado potato beetles, root nematodes, Mexican bean beetles, and aphids. Attracts hoverflies (aphid predators). Use as borders and interplantings.

Cornflower (Bachelor’s Buttons)

Continuous nectar flow draws ladybugs, parasitic wasps, and other beneficials. Excellent border or insectary strip.

Borage

Magnet for beneficial insects—often 100+ per square yard. Predatory wasps, hoverflies, and bees flock to its blue flowers.

Rue

Small evergreen shrub; strong scent repels leaf‑eaters and soil worms. Plant as a perimeter barrier.

Anise Hyssop

Nectar‑rich perennial attracts butterflies and pest‑eating insects. Grows to 3 ft; site where it won’t shade lower crops.

Design Tips

Mix repellent and attractant species throughout beds. Avoid monocultures. Observe which insects appear and adjust plantings annually.