This doesn't look like pokeweed (poke salad) to me. Normally poke salad stalks don't turn red until they get much bigger. When they are this small they are still pickable and edible.

Yes there were! Thanks to all! I believe I bought a hummingbird seed mix that had Nasturtium seeds. But I would say half are turning yellow and dying, and I think it's the heat. I don't have much shade, but I'll see if I can't relocate the remaining ones. It's a cute little plant! Thanks again!!

Great..Now that we know what they are, how do you rid of these horrible things..I saw this problem comming when my neighbors decided to let their yard be over run.. They gave up and let them win, until I stepped up to the plate to keep their yard up, and these things keep coming back.... They inched closer and closer to my manicured flower beds, and now I have them.. What works so I can get a head start next year? How do you kill weeds that have root feeders? Maybe Roundup? I hate chemicals..But if this the only way, I will use the stuff, even if it shortens my life..Arg Thanks so much...

It is an extremely common late winter/early spring annual weed. Get questions about it here all the time when it is in season.