Definition of knotgrass in English:
1A common Eurasian plant of the dock family, with jointed creeping stems and small pink flowers. It is a serious weed in some areas.
- Genus Polygonum, family Polygonaceae: several species, in particular P. aviculare
- The main weeds dying back were creeping thistle, couch and mature knotgrass.
Definition of knotgrass in:
- US English dictionary
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