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Control it with some selective roundup for this season. Next season, prevent it with by doing a few things:
1. Make sure your preemergent is getting all the way to the corners and sweep whatever lands on the pavement into the cracks that’s it’s growing out of.
2. Apply your weed and feed a little more frequently.
3. When you trim, be careful you don’t take too much off or edge too far into your lawn. The reason you have crabgrass there and not in the middle of your own is that you’ve created some opportunity for it to grow, likely by trimming too short around your sidewalk.
4. And of course, Milorganite the piss out of it. As someone else mentioned, the best weed preventer is a thick lawn.