Some plants make powerful allies in the battle against harmful insects.
Rani Jacobs, who runs a shop in Los Angeles that caters to organic gardeners, suggests a number of helpful plants that can enhance your garden. Some plants are physically compatible. The lettuce appreciates some shade, which the collard provides. Another example of companion planting is training a squash to grow on a trellis to provide shade for lettuce to grow underneath. Some plants benefit the garden by fixing nitrogen, which enriches the soil.