I completely reseeded a lawn here in Northern NJ last year and it looked great until July when they went on vacation and stopped watering their front lawn for about 3 weeks during a dry spell. The lawn was pretty much taken over by crabgrass. Whats my best option for this year. I want to put down a crabgrass preventer plus sections of the lawn is in need of reseeding. How long after preventer can I reseed? I know what the bag says but I to get your opinions. Thanks.