I found cogshall too vigorous to maintain at 6' tall or less. Mine is in ground, and really would rather be 8-10' tall. I top worked it replacing with Fairchild which I hope will be easier to control. Not sure how much being in a pot restricts vigor, would be interesting to hear from someone growing cogshall in a container. Pickering is a great choice, mine is in ground but will be easy to keep at less than 6 feet, is currently only 4' tall and has been producing for 3 years.