Companion planting for natural pest deterrence

Companion planting uses specific plant combinations to repel pests, attract beneficial predatory insects, or serve as trap crops that lure pests away from valued plants. This is a supplemental pest management strategy, not a standalone solution. Proven combinations include: marigolds (Tagetes species) throughout beds to suppress harmful root-knot nematodes and repel whiteflies; basil near tomatoes to repel aphids and hornworms; nasturtiums as trap crops to attract aphids and cabbage caterpillars away from brassicas and beans; dill and fennel to attract parasitic wasps and lacewings (beneficial predators); chives and garlic near roses and brassicas to deter aphids and Japanese beetles; sage near brassicas to repel cabbage moths; borage near tomatoes and squash to attract pollinators and repel hornworms. Plant companion species in corners, edges, or interspersed throughout beds. Do not overcrowd; companions need their own space to thrive and produce the volatile compounds that deter pests. Rotate companion plantings annually along with your main crops.