There are many companion plants that can either repel pests (e.g pyrethrum daisies) or act as sacrificial pest control or early warning system (roses on vineyards for example). Basil goes particularly well with tomatoes, on the plate and in the garden. Then there's symbiotic relationships between plants, between plants and soil microbes (fungi and bacteria). There are myriad relationships in this complex web, the primary role of the gardener is to tend to the health of the soil.
Stuff like this is why I want land and a massive garden (small farm). I am working on it. Property is full-retard these days though so maybe it will work out better than I thought if I can just wait enough.
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