Umm...asparagus roots can go down several feet and spread for at least 2' on each side of where the stalks appear.
The key to keeping an in the ground bed weed free is heavy mulch. 6" of mulch, spread out at least 18" from the center of the row, on each side of the row, would be about right. Make a couple inches of that mulch composted manure and you'll have an asparagus bed that will produce top notch monster spears.
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