It's impossible to encourage a new lawn that is being taken over by
crabgrass to grow and choke out the crabgrass. Watering and
fertilizer at this point will just make the opposite happen, with the
crabgrass choking out the grass. I agree that maintaining a thick
healthy lawn is the first and most important step at keeping crabgrass
out, but it won't get rid of it this year when it's already there and
killing off the new lawn.
Next year, instead of putting down a pre-emergent
There are pre-emergents available that can safely be used on recently
seeded lawns. But re-seeding should be done in the fall anyway.
Based on what I've heard so far, his best bet is to get a professional
in to kill the crabgrass now with Acclaim, save the lawn, and avoid
having to re-seed.
It will take awhile, a few years maybe, but in the end you'll have a
Good reasons to use Acclaim, it will kill even mature crabgrass
effectively, and doesn;t contain arsenic.
Given a choice of 3 years of looking at crabgrass and the trouble and
expense of reseeding, I'd go with the Acclaim.
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