Also known as companion planting, the companion plant benefits another plant when it is placed near it (repellent, fertilizer, etc.).
Chamomile placed alongside onions, cucumbers and any of the cabbage family improves their yield and repels certain insects.
Basil placed near tomatoes slows down pest infestation.
Sage planted near beans enhances their flavour and protects against chrysomelidae.
Oregano stimulates the growth of beans.
Thyme protects cabbage against certain pest insects. This herb also attracts bees, which are necessary to pollinate tomato and potato plants.
Chives reduce white mould and attract aphids away from other plants.