Eggplants come in several varieties, with the most popular being Black Beauty. Generally, eggplants can grow to small and large sizes, with some hybrid species even being seedless, and come in purple-black shades or white. When adding any eggplants to your garden, all varieties enjoy heat and will be damaged by cold and frost. When adding these, remember to plant them about 24 inches apart and to give the plant full sun and plenty of water.