Common Name: Knotweed (Common Knotweed, Knotgrass)
Latin Name:Persicaria spp.
Family Name: Polygonaceae
Knotweeds contain oxalic acid which binds to much-needed calcium and minerals, thus preventing their absorption. It also contains tannins and has diuretic tendencies, so it is best to avoid feeding it to your tortoise.
Knotweed flowers are most usually pink but can also often be found in white. Some species of Knotweed are cultivated and grown in gardens.