Hi Megan,
I posted it two months ago on the Houzz Allium Forum. I read it in Ted Meredith's great "The Complete Book of Garlic", in the chapter "Planting the Cloves", specifically page 122 in the hardcover edition. It is a little known fact about garlic.
The book says (p93) that rounds are more likely to form if exposed to warm weather immediately following fall planting, dry conditions in the spring, or spring planting. They are also common when planting bulbils instead of cloves.
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