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It probably isn't advisableIt probably isn't advisable to plant in summer. In Zone 6, you want to plant in fall so that the seed cloves establish roots before a freeze, but don't actually start to grow leaves before the cold weather hits. If they do start to grow leaves and then cold temperatures kill the leaves, the health and vigor of the bulb will likely suffer; next summer's harvest may produce small bulbs. We'd suggest that you contact the company where you ordered the garlic for advice on how to best store the seed garlic before you plant it. In general, keep them in a cool, dark, dry place, with good air circulation.

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