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Bob F

wrote:
"burn" it down with roundup, then till and remove as much rood matter
as possible by raking - wait for it to green up again (water it if it
doesn't rain) then hit it with roundup again to kill it, and till it
again - removing as much root material as possible.

Skip the roundup. Tilling weeds under shortly after they sprout will kill them.
Just do that several times. It worked great for me converting a weed patch to
ornamantal garden beds. I tilled 3-4 times over a couple months of a Seattle
summer.