How do I get rid of crab grass?
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https://www.thespruce.com/how-to-kill-crabgrass-2132940
People swear by using boiling water to kill them. Here’s a link that gives you more options, too. All cheap and pretty much home made. Hope this helps.
https://www.treehugger.com/lawn-garden/homemade-herbicide-kill-weeds-without-killing-earth.html
Dig it out or cover in black plastic to kill, then dig out and start over.