Jimsonweed. I notice that it is growing next to a pile of soil. The seeds might have come in with it.

Ya know, Vera...I was thinking that too. I had one that died and now that you mention it, it sure reminds me of it Especially the bud, which as I said, I couldn't get a good pic of. But to me, the bud really resembles Blanketflower. Guess I will just have to wait and see. I wanted to stick it on into the ground but think a pot is best for now till i figure it out. Thanks for you help! bonnie

It's a peony. Google for some images and see if you want to keep it.... I'm going to guess you will. They bloom in early summer, require little care and the foliage will look pretty good most of the year. They make nice cut flowers and if you don't cut them you might have to stake since the blooms get floppy.

This is Polygonum persicaria, commonly called Knotweed, Smartweed, or Lady's Thumb. It is native to Europe and considered an invasive species here. (I just looked it up so don't be too impressed!) I've actually been using these plants to fill space in my big new flowerbed for a couple of years. I pull all but 3 or so. They are almost 6 feet tall right now and about 8 feet around. The stems of some of them are bright red and very pretty. The only thing is trying to decide when to cut them all down to prevent a million little babies next year. I let one go to seed in a corner of my vegetable bed last year and this spring I literally had a carpet of little baby plants, and they germinated in succession. I pulled babies for a couple of weeks and they just kept coming. I ended up just spraying them all with roundup. If you can control its potential to take over, I think it's a really beautiful plant.