Pull out the crab grass. Crab grass tends to like barren sunny soil,
so if you used some kind of groundcover or mulch, you'll get less crab
grass. If it allowed to seed, the seed will be viable for over 10
years. My thyme is very thick and is spreading--nothing competes
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.
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