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I am seeing this grass all over the lawns here in Southeastern Pa. Any idea what this is? enter image description here

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Based on the timing of the grass's appearance, its color, the alternate/nearly paired arrangement of its blades, and its form, you have crabgrass. The base of the grass's blades is often a purplish color, which is also an ID key.

Here's more information on identifying crabgrass. Note that the first photo in the attached link shows a much more mature clump than the ones in your lawn.

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