Space eggplant 24 to 36 inches apart and stake them once established to prevent toppling. Choose an area with abundant sunlight and fertile, well-drained soil. Improve native soil by mixing in several inches of aged compost or other rich organic matter. Keep soil moist but not soggy—soaker hoses are a great option. Eggplant has antioxidants like vitamins A and C, which help protect your cells against damage. It's also high in natural plant chemicals called polyphenols, .