Lyceum barbarum is not a tree but a very lax growing, suckering shrub. It grows wild around the coasts here and slightly resembles brambles in its habit ie sprawling and spreading. I should think that if you want to grow it as a standard it will need permanent support and constant removal of any side growths and suckers. I'm pretty sure that would considerably reduce the amount of fruit you can expect .

Here is a link that might be useful: Goji

I just received two goji plants and put them in 1-gallon pots three weeks ago where I will leave them until spring. I plan to put them in my backyard, but the raised garden bed is not yet ready. They are growing like wild fire; already grew 6 inches. During my research, I found that if grown in a container, the growth is limited by the size of the root system, i.e. the container. I also found that you can shape them by pruning. Prune your goji in the early to mid-spring while the plants are still in their dormant period. Do not prune later in the season, as this will disrupt flowering and fruit set and may stress the plant. Cut away any broken, dead, diseased or cracked canes each year and trim back any canes that are sweeping or lying on the soil surface. Cut down to a point of healthy tissue and discard the troublesome cuttings. Remove up to 1/3 of the oldest, longest canes each spring to make way for new growth. Canes fruit in their second or third year so you want to have a mix of new growth, 1-year-old canes, 2- and 3-year-old canes as well as a few older canes for optimal health and fruiting performance. Cut the oldest canes down to the crown of the plant just above the soil line.

Read more: How to Prune Goji : eHow.com http://www.ehow.com/how_6979043_prune-goji.html#ixzz2IKPzT8Ju