We usually grow ours in 12" pots, but 9" will prob. be fine. Or a grow bag. Secret is to water and feed regularly.

thankyou

Consider this if you want to use growbags;

Instead of laying them flat form them into effectively two pots by;

1) Before opening the bag grip the bag at its centre and let equal amounts of compost trickle to either end of the bag.

2) Cut the bag in half, roll down the bag edges this will help to stiffen the bag.

Cut a few drainage holes in the bottom of the bag, voila!

You have two big pots ready for planting.

9" sounds a bit small to me - give 'em as much root space as you possibly can.

Yes, normally I would have said that a 12" pot was the minimum size possible.