it has been my experience that most lawns are cut way to short making the crab grass take hold
as it has no competition for sunlight was my point.
Grass loves the cold and you can spread grass seed right up to just before the snow arrives because that's how nature does it.
the weight of the snow pushing down on the grass seed makes it germinate and in the spring grass will begin growing right thru thinning snow.
It responds to FIRM contact with the soil which is why rolling it flat like they do on golf courses makes such a difference.
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