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Old 11-03-2017, 07:20 PM
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I have two different questions:

1) I have applied over seeding on existing lawn (with a few small dead spots) early fall, but it does not go well. So there is another chance of dormant seeding (between early December and snow time, my last time cleaning yard should be early December, I may put down seeds after cleaning yard last time). But if I apply dormant seeding this winter, then I should not apply Pre-M next Spring, correct? Pre-M prevents weeds, but it should also prevent grass seeds to survive. So I should choose only one of them, correct? Probably I will choose pre-M and apply over seeding next fall. It is difficult to manage lawn without applying Pre-M.

2) I also have new Lawn, the new grass is still weak. Can I apply pre-M on new lawn next year? Will pre-M kill new weak grass?

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Old 11-08-2017, 02:35 PM
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Usually I only get my crabgrass in the front lawn, where the seeds blow in from other neighbors yards, so I do my Pre-emergent there in the spring.

In my back yard, i'll typically do a overseed around Labor day, and then sometime in January/Feb when there's no snow on the ground, i'll do a dormant seed. By that point the grass has gone dormant, has thinned out, and the seed can get to dirt, where snow and frostheaves push the seed in better contact with the soil. Come spring, my lawn really thickened up.

My front lawn gets the pre-emergent, so I won't dormant seed that. The Pre-emergent only prevents seeds - ALL SEEDS - from germinating. Once the seed sprouts, it does nothing and won't hurt. So if you plan to put this down come spring, don't bother.

My lawn is now well-established, so my game plan is to overseed in the fall and then pre-emergent and weed control in the spring/summer. I have a few small areas that come early spring, i'll aerate and seed. But I can mark these up and avoid all preemergent here.
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