I have been growing goji for 20 years. I don't get enough berries to make juice but I do get a bag worth that I freeze and use with my morning oatmeal. They are considered a super berry. The plants are very cold hardy, mine survive -35c winters.
It may take a few years to deliver fruit. Mine are starting to flower now and producing fruit. I am in the heart of my summer and the berries are usually ready to eat by mid sept. some say they should have a frost. the berries are ready when red, orange are bitter, red are suppose to be sweet, I have never tasted sweet, though others claim my berries are sweet. I have eaten lots of unripe berries and since I am typing this from our world, have not suffered from the poison effects.
During the winter months, I sow seeds, grow them indoors then give the plants away to friends. I do plant some of the seedling around my house to keep fresh plants but it is not necessary as the plant self propagates by new rooting. I have several new shoots darting up in the middle of my veg garden, 3 - 4 feet from the main plant.
Good growing