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You could have what we over here call couch grass. It's roots run under the soil, the best cure is a dutch hoe. Mind you I have only a small area compared to some of you. Advantage of hoeing is that not only do you cut the weed off from its roots but you turn the soil into a mulch that helps stop evaporation from the soil. And it's cheap, just a few bucketfulls of sweat. That's what I call really organic. Sussexman