“It may be that one plant attracts pollinators or deters insects, while another enhances nutrient intake. Whether you have a large plot or a small raised bed, combining certain fruits, vegetables, flowers, and herbs will improve your garden’s biodiversity,” explains George Pisegna, the deputy director and chief of horticulture at the Horticultural Society of New York. From tomatoes and basil to eggplant and spinach, see below for experts’ favorite companion gardening combinations, what to do with them, and a few gardening tricks.