James expounded:

What ever method you use would work better if you use Roundup or its
generic to kill off everything first.

Roundup does nothing about weed seeds, which is what the original
poster's problem is. Nevermind that this is a vegetable garden; I
wouldn't use Roundup in the first place, but on ground that will
produce food??!? I don't think so!
--
Ann
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