Question: Hi, I live in Chicago, IL. I have a beautiful Kentucky Blue Grass lawn I am meticulous about caring for. I recently noticed a lot of "knots" where the grass is bunched in a knot and growing in all directions within the knot. They are approximately the size of a plum. I have been pulling them out. Do you know what causes this to happen? Is is crabgrass? Should I pull them out? Thanks so much!
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