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Originally Posted by p911dad
I have been fighting that pest for years. The only way to really get rid of it is multiple applications of a pre-emergent herbicide in the early spring. Normally, the actual plant is killed off by the first freeze. The plants of course leave seeds waiting to germinate in the spring. The pre-emergent prevents the seeds from germinating (also any grass seeds you have put down). Once it is up and growing it is near impossible to kill off, normal herbicides don't touch it. Roundup is a little extreme, as it will kill everything else as well.
This past spring I really hit it hard with Scott's Halts, and no crabgrass this year. I have other weird weeds but no crabgrass.
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Some of the behavior being talked about here doesn't sound like crab grass to me. Once I pull a crabgrass plant out, it's dead. Crabgrass grows primarily from seed and spreads very little by rhizomes. But one plant can put out thousands of seeds.
We have some variety of creeping bent grass in the midwest that spreads through rhizomes that is nearly impossible to get rid of. It starts off as a plant or two and soon it's a spreading mat of weedy grass. The only way to get rid of it is Roundup in August and replant in Sept.