Crab grass has a extensive root system. I am guessing the best way would be
to till the entire area and spend a few days pulling out the grass and
roots. You might have to go over it a few times with the tiller and keep
picking out the grass & roots.

Dave
"Amy Fong" wrote in message
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I'm started a thyme lawn from seem and there's lots of crabgrass to
contend with. What is a good way of getting rid of the crabgrass (and
won't harm the thyme)?

Thanks.