Companion plants work for a variety of reasons. For example, in addition to triggering defense responses, mint also repels certain animals that might eat nearb

Companion plants work for a variety of reasons. For example, in addition to triggering defense responses, mint also repels certain animals that might eat nearby plants. Chives and garlic can work the same way. In some cases a companion plant's flowers attract predators of a troublesome pest. The immune response angle is neat though.