Does anyone know what this is? I've spent hours searching and can't figure it out. It starts out looking like a dandelion, then it just gets taller and taller. The plant is now about 6 feet. The stems are hollow.
I've seen what looks like the same plant growing near where I live, but I don't know what it is either. You might try the "Name that Plant" forum - you will usually get a response there, often within a few hours or even minutes.