I dug up a new flower bed two weeks ago here near Boston, and sowed flower seed from a packet of mixed flower varieties. Things are starting to germinate which I recognize as species from the flower blend, but a lot of these fellows (photos below) are also coming up. I have a sneaking suspicion they're not part of the mix and that it's in fact a weed, possibly something I can't yet recognize since only the cotyledons are present for now. These seedlings are VERY tiny, about 3/16" from edge to edge -- they look larger in the photos because I magnified them so I could get a better look. I suspect they're about 5-7 days old. I'm struck by their copper-red color. Any thoughts as to what plant this might be? I'm sure I'll know more once the real leaves develop.
I'm not entirely positive the seedling with the larger leaves (real leaves) (below) is the same plant, but I think it is.
