Not to worry, the height will come with ease with these plants.I have these seeds and man I cannot wait to plant them this start of Summer. Hoping for some serious height.
This one germinated April 1st and is about 8 feet tall right now. It was topped early and I had kept it in a 1 gal container for a couple months to try and tame the vigorous growth. It's been in it's final 20 gal fabric pot since the first week of June.
A few of the lower leaves were scorched by the triple digit heat this past month. But nothing too bad thankfully.