Dealing with crabgrass on your lawn is reasonably simple
Crabgrass is an annual grass that grows well in lawns with poor drainage or lawns that are poorly watered, as well as unfertilized and think lawns – in other words, they survive in conditions that are less than optimal for the lawn you want.
As annuals, they produce seeds and then die off in the fall. That gives you an advantage if you can prevent the next...