Polygonum aviculare
(Prostrate Knotweed)

Other pictures of this plant:

               Seedpod                                           Leaf                                            Stem                                        Seed                                          Habit

Facts About this Plant:

    Common Names: Prostrate Knotweed, Birdweed, Pigweed, Doorweed, Knotgrass, Dooryard Knotgrass, Lowgrass
    Synonyms: Polygonum heterophyllum, Polygonum monspeliense
    Lifespan: Annual
    Zones: N/A
    Type: Forb
    Bloom Time: June - October
    Status: Native

Polygonum aviculare, or Prostrate Knotweed, is native to the entire United States, though some dispute whether only certain subspecies are native. It is an annual that grows in yards, fields, waste places and disturbed areas. It blooms in the summer and fall, with small white and green flowers.

This plant is a weed of yards and waste areas. Some authorities attempt to split it into subspecies, saying some are native and others are not, based on small differences in petal shape or leaf arrangement. We do not here, and consider the species native in tandem. More information will be posted later on differentiation from other species.

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