I have this giant plant growing in my front garden bed. I've torn it out except for one stalk because I got distracted before I was finished. It is now up to the roof on my ranch house. I'm thinking that it might be a giant ragweed. I plan to tear the rest of it out when it stops raining at the end of the week. I would love for it to be something other than ragweed because it is growing beautifully. The pictures are from various stages in its growth. There are no blooms on it yet.