Answer: Poa annua, annual bluegrass, spreads by seeds and by rhizomes and isn't your typical annual, at all! Unfortunately, the only way to remove it is to dig it out roots and all, or use the herbicide glyphosate (Round-Up). Because the weed is so similar to the desired grasses in most lawns, anything you use to kill it will kill all grasses. Get a jump start on it now and you won't have to battle it all summer. The brown patches will green up in a few weeks after planting - and April is an excellent time to reseed bare areas.
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