Polygonum pensylvanicum L.

Polygonaceae (Knotweed family)


A member of the Knotweed family, smartweed is a native, warm-season annual. It is also commonly named Pennsylvania smartweed, pinkweed or pink smartweed.

The leaves are long and narrow, ending in a point. This plant bears white to pinkish flowers from March to November. It is commonly found growing around ponds and streams.

The forage value of smartweed is poor for livestock and fair for wildlife.


Smartweed grows in wet or disturbed soils.