I am 99.9% certain that it is commelina communis. I have it... lots of it! It is beautiful, it is invasive. Plus side: it is very easy to pull, and in my opinion, it improves the tilth of the soil where I have pulled it. It seems to co-exist quite well I suppose because of the shallow roots. I leave it alone where it is filling in an empty space that otherwise might have dandelions or creeping charley! Then if I want to plant something there, maybe a hosta in shade, or a daylily in sun, I just pull it and have this nice soil all ready to plant. A beautiful plant that I detest is lady bells, virtually impossible to get rid of, 100x worse than commelina!
