I was given 2 Goji Berry plants this year that just grew and grew (they are both in tubs). I kept one in the greenhouse and it is now growing out of the open vent at the top of the greenhouse! I trimmed them earlier in the year thinking it might restrict the growth a bit and one carried on getting taller and the other grew lots of side shoots and is very sprawling. I have been told they are quite hardy but am not sure what to do next with them now as I am hoping for some fruit next year. Sadly I have no where to train them against so they will have to cope, but can anyone help with when I should prune them - and how - please. Any other advice would be good too. Thank you.