Basil: An Herb Society of America Guide
Outdoor Cultivation
Companion Planting
Basil is most often used as a companion plant for tomatoes. Although some gardeners claim that basil can improve the growth and flavor of tomatoes and repel insects, this is more folklore than science. One good reason to plant basil and tomatoes together is for convenience (51). Both plants have similar growth requirements (84), and their complementary flavors make close proximity a boon for harvesting (51).
Mark Langan cautions gardeners to take care when planting basil with tomatoes. He
recommends planting the basil 3 feet from the tomato and on the south side so that the tomato plant doesn't shade the basil or impede air circulation.
As an alternative, Mark suggests planting one basil and one tomato in an 8-inch pot and allowing the tomato to trail over the side (51).
James Adams encourages gardeners to think of basil as a companion plant, but in the ornamental rather than the traditional sense. He mentions that purple basils look great with gray plants and brighter colors. 'African Blue' can be grown with pineapple mint and oregano for a nice looking combo. Basils also look great with flowers (1). Susan Belsinger has interplanted with marigolds (8). 'Magical Michael' is attractive ornamental with dark bracts and flowers that mixes well with different garden flowers (1).
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