I started my spring garden a few weeks ago and planted several things in organized rows with labels on each section. About 2 weeks ago, in the patch where I planted onions and little onions are sprouting up, something I don't recognize began sprouting and doing very well. I tried planting a fall/winter garden last year, but I wasn't successful so I imagine it's coming from seeds I planted last autumn.
Does anyone recognize this plant?
Here it is close up:
And here it is next to a mature onion plant:
Thanks in advance!