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I would buy the Mammoth seedsI would buy the Mammoth seeds and plant them in individual pots in full sun. I have one that is about 12 feet tall right now and is just getting ready to open. Can't wait! You will probably need to support it with a stick and string because they like to lean when they start getting tall. Their heads bow naturally.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?