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The bulbs are probably small.The bulbs are probably small. You can eat them now or let them keep growing as long as the tops are green.  It will just take longer. You may be harvesting in August. Onions send out a leaf for each layer on the bulb. If some of the leaves fall over, it will send out more. No worries.  

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