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You can leave the plants andYou can leave the plants and let the seeds dry on the plant. If you live in a region that is humid or gets lots of rain it's better to remove the heads and dry the seeds indoors. After you remove the heads you can pull the stalks up.

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