I am looking for something to kill the crabgrass that is not harmful to my cats. What would you suggest. I have a very small area of grass and half is crab grass by the middle of August

There are crabgrass killer sprays that you can use on crabgrass but they aren’t reliably effective and not organic.  You best approach will be a crabgrass preventer applied at the right time in spring.  The “right time” can vary though.  Your organic option will be corn gluten.  HERE’S a link to more on crabgrass preventers and how to time you spring application.

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