I had a section of lawn that had crabgrass in years past. This spring I used a product that contains Dimension (thanks ahlg). It worked great. I have some stray crabgrass plants that I deal with spot treatment.
Will I ruin my Dimension for next year if I de-thatch this fall/next spring? That is, how long do I have to wait for the crabgrass seeds to finally die before I'm able to dethatch?