Flowering patch. It's so common in the wild that I usually just ignore it. Here's a very lush patch, in a test plot for commercial cultivation. MTT Karila research station, Mikkeli, Finland. Planted. 2001-08-13.
Polygonum aviculare L. Engl.: prostrate knotweed, knotgrass, knotweed. Deu.: Vogelknöterich, Knotenwegerich, Wegtritt. Suom.: pihatatar. Sven.: trampört, trampgräs. TCM: bian xu
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