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Prostrate Knotweed
Life cycle: Annual
Leaves: Small bluish-green leaves.
Stems: Wiry stem. Grows flat.
Flowers: Small clusters of pink-white flowers.
Roots: Taproot
Comments: Germinates very early in high traffic areas. Papery sheath covers knot-like nodes.
Control
Cultural: Aerate compacted soils
Foliar Herbicides: Products that contain 2,4-D and dicamba (Weed-B-Gone Max, Trimec, WeedStop, and others), triclopyr (Turflon), carfentrazone (QuickSilver), metsulfuron (Manor), and fluroxypyr (Spotlight).
Soil Herbicides: Many soil applied herbicides for crabgrass, such as pendimethalin (Pendulum) or dithiopyr (Dimension Ultra). For landscapes, may use isoxaben (Gallery or Portrait).