I have a tree (or weed or some kind of plant) growing out back of my house.


Your description isn't bad, considering some that we have had. however, you
neglected to say where you live. That would help.
If you are in a warm climate, one possibility is a banana plant.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)