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The non grass stuff will spread and kill the grass. You’ll end up with bare dirt patches. So weed and feed now to get that stuff dying, probably another in late summer, then do an aerate and seed in the fall which is the best time to do it anyway.I'm still not getting it.
Sounds like more green, soft, fine looking non-grass
Why is that bad?
Weed and feed is something you do 4x a year, but can get away with 2x usually. You don’t want to do it right before or after the aerate and seed because you want those seedlings to take hold. If you weed and feed a second time like maybe a month or so before the aerate and seed you’ll be ok.
Just make sure the weed and feed happens right before rain comes or plan on watering it yourself, some can burn your lawn.