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Congrats on your nice-sizeCongrats on your nice-size onions! A mature Georgia Sweet bulb is about 3 inches if you space correctly.  But there is no perfect size, just pull when they are big enough to suit you, even if they're smaller "spring" onions.

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