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. (source: eHow.com)
An easily grown plant, it does not require a rich soil, flowering and fruiting better in a well-drained soil of moderate quality. Succeeds in impoverished soils, but more fertile soils are best if the plant is being grown for its edible young shoots.
Lots of very useful info about medicinal uses and cultivation: victoriananursery.co.uk/Goji_Berry_Plant/
Genus - Lycium
Species - barbarum
Common name - Goji Berry
Pre-Treatment - Required
Hardiness zones - 6 - 9
Height - 8' / 2.40 m
Spread - 10'-15' / 3 - 4.60 m
Plant type - Shrub
Vegetation type - Deciduous
Exposure - Sun to Partial Sun
Growth rate - Medium
Soil PH - Acidic, Neutral, Alkaline
Soil type - Well Drained Clay, Loam, Sand
Water requirements - Average Water
Landscape uses - Woodland Garden Sunny Edge, Dappled Shade, Hedge. Lots of medicinal uses. Edible fruits.
Bloom season - End of spring
Leaf / Flower color - Green / Purple
1. Mix sand and goji seeds together. Place in airtight bag and stratify cold moist for 15 days (mixed with sterile sand or vermiculite).
2. After the prepteartment, soak for a few hours.
3. Sow on the surface. Cover with clear plastic or grass. Keep moist and in very warm (+25-28C) temperature for germination.
4. An alkaline soil of pH 8.2 to 8.6 is the natural habitat of wolfberry.
5. Germinated berries should be planted about half an inch down in the starter pots, a lot deeper for the larger ones. An actual seed of wolfberry is smaller than that of tomato. In our experience, it will take 10-14 days for them to start coming up. The first green shoots will be tiny leaves that you have to look after them carefully. There is no doubt that once the plant sprouts, it will live. However, they grow slowly during the first few months.
The time seedlings have outgrown their starter pots, you can put your small Goji shrubs in buckets of 5 gallon, with drain holes punched at the bottom.