This popped up in the garden. I'm not sure what it is or whether or not I want to keep it. Can anyone tell me what it is?
It is a little hard to tell from the photo, but it looks to me like it is a type of milkweed called balloonplant:
ETA: Depending on your location, this plant could be invasive. It is impossible to know whether it is a problem without knowing where you are. It is a milkweed, though, so offers the same benefits to monarchs as other plants in the milkweed family.