Many vegetables grow well with other plants in the garden and, using a few basic principles, organic gardeners can really have nature on their side in the biological control of pests.
The most commonly documented companion plants help to repel pests when planted alongside vegetables. Other plants attract pest predators to the vegetable patch. Some plant roots secrete substances that repel pests or provide nutrients to the plants around them. These plant interactions can work in specific ways between two or three types of plants or species.