How to Grow Goji From Seeds Goji is the commercial name for two species of boxthorn, Lycium barbarum and Lycium chinense. These plants originate from southeastern Asia, and growers in China cultivate goji commercially. The fruit is orange-red and less than 1 inch long. The flowers are about 1/2-inch wide and light purple in color. Goji grows readily from seed, but the seedlings are sensitive to changes in temperature. Home gardeners typically grow goji seedlings in a greenhouse for the first year. Instructions 1.Fill a planting tray with garden soil in the early spring. Sow the goji seeds on the soil in the tray, and cover the seeds with a thin layer of soil. Move the planting tray to the greenhouse, and keep the soil moist. 2.Remove the goji seedlings from the planting tray when they are large enough to transplant, usually within six months. Plant the seedlings in individual planting pots, and keep them in the greenhouse. Water the seedlings to keep the soil moist. 3.Select a planting site for the goji plants. They are hardy in U.S. Department of Agriculture plant hardiness zones 6 through 9, meaning the lowest temperature during the winter falls between minus 10 and 30 degrees Fahrenheit. Goji plants should be in full sun. 4.Prepare the soil for the goji plants. Goji can tolerate a range of soil types, so long as the soil has good drainage. Goji plants thrive in acid and alkaline soils and have a high tolerance for salt. 5.Plant the goji plants in the outside site in late spring to early summer. Water the plants as needed to provide at least 1 inch of water per week during the growing season. 6.Pinch the tips of growing goji stems to make the plant bushier. Prune the stems to a height of 2 feet in late winter with pruning shears. Goji can seed itself in the spring if it survives the winter.