Any tree on the property of an asian person or near where asian people reside the has banana peels thrown in it. It is considered a normal "banana tree" not "banana-tree", if the tree actually grows bananas or is not near asians. The peels are usually put there by non-asians, but it would not be surprising if asians started making their own banana-trees for decoration.
John: Hey Joe, want to go make some banana-trees?
Joe: Yeah! That sounds like a dandy time, ill go pick up a bunch.