Once the daytime temperature drops to around 50 degrees, the plant will go dormant. Come spring when the temperatures climb above 50 degrees it will come out of hibernation and begin a new season.
If you live in an area that doesn't get winter extremes, keep your goji plant pruned back to new growth only, this will keep the berries coming.
Some seasonal weather conditions promote new growth that will flower toward the tip and produce berries that generally never ripen properly and frequently becomes infested with a grayish mold which, if not controlled, will often carry over to the next season's fruit crop. I suggest that these late season berries be removed as they develop, by picking or pruning the fruits or flowers as they appear.
Pruning is generally done when the plant is dormant, in the winter, but they can also be gently trimmed during the growing season to shape for aesthetic value, management purposes and of course to improve berry production.
The first year you should only need to prune weak or damaged growth if the need arises. Come the second year identify the largest, healthiest shoot, which is the main trunk. Gradually remove the lower lateral shoots, with the goal in mind of keeping the trunk clear for the first 15-inches, and then when your Goji plant reaches about 24-inches , remove the growing tip in order to stimulate the growth of additional side branches.
To prune mature plants, remove the branches above the height that you wish to maintain your plant at. Near the bottom of the plant, clearance from the ground should be about 12- 15-inches. You should also remove any any damaged, dried or no productive branches. These usually grow very fast, straight and smooth and will not be very productive, so if they aren't essential to the overall appearance and production, they can be removed. The Goji Berry plants when permitted to grow wild will leave you with an unsightly and unproductive mess. You should always prune the plant after growing season as berries are produced on new growth only.
Once you've harvested your first Goji Berry Crop, you'll probably have more than you can possibly use - consider drying some, they make an excellent snack.
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