hey Dee,
I had rounds that got left in the ground, and eventually produced some large enough rounds to get full size garlic. If the ground is fertile enough and well drained I don't see why you couldn't leave them. Maybe thin them out each season and add some ferts, so the keepers continue to grow.
I guess the other concern with leaving them in the same place is the risk of pest or disease setting in. But if you do thin them out each year at harvest time, you can inspect what you pull and make sure nothing's awry in the permanent bed.
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