Pennsylvania Smartweed (Polygonum pensylvanicum L.)

↑Range - Expand

Legend	Color
Native
Expanded
Native or Not Present
Native or Expanded
Expanded or Not Present

This tentative map is based on our own research. It may have limited data on Canada and/or Mexico, and there is some subjectivity in our assignment of plants as introduced vs. expanded. Read more in this blog post.

This species is rather weedy, and rarely planted, but frequently spreads on its own, although humans likely aid its seed distribution into new areas through moving soil or seeds sticking to vehicles, and through creation of disturbed habitats that it favors. We mark new Western populations as expanded because of this plant's weedy nature and because they are mostly contiguous with its native range, separated only by relatively small distances.