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Wireweed or Knotgrass (Persicaria aviculare [syn. Polygonum aviculare]), a widespread annual that is a weed of cultivated land, both in commercial crops and gardens. It grows quickly, is competitive and its seeds can remain dormant for prolonged periods. Its flowerheads form in the leaf axils and are very small in comparison to those of most other species in this genus.
![Wireweed or Knotgrass (<i>Persicaria aviculare [syn. Polygonum aviculare]), a widespread annual that is a weed of cultivated land, both in commercial crops and gardens. It grows quickly, is competitive and its seeds can remain dormant for prolonged periods. Its flowerheads form in the leaf axils and are very small in comparison to those of most other species in this genus.](./data/media/1/CFGdg12.jpg "Wireweed or Knotgrass (<i>Persicaria aviculare [syn. Polygonum aviculare]), a widespread annual that is a weed of cultivated land, both in commercial crops and gardens. It grows quickly, is competitive and its seeds can remain dormant for prolonged periods. Its flowerheads form in the leaf axils and are very small in comparison to those of most other species in this genus.")