In the United States, most eggplant are grown to about 2-3 feet tall, although the variety ‘Big Jim’ can grow as tall as 6-8 feet. The plant is vigorous, with large leaves and many side branches. The fruit can weigh up to 10 pounds and is dark purple in color. Eggplant is a cool weather crop and should be planted in mid- to late spring in fertile soil. Eggplants are ready for harvest when the skin is tight and firm. Leave them on the plants until they start to shrivel, then cut off the top of the stem and remove the fruits.