Rumex crispus, the curly dock, curled dock or yellow dock, is a perennial flowering plant in the family Polygonaceae, native to Europe and Western Asia.
Yellow dock is a perennial herb belonging to the Polygonaceae family, commonly referred to as the knotweed family. This family also includes rhubarb, buckwheat, and sorrel. Mature yellow dock stands no more than 4 feet tall and is reddish-brown in colour.
Curly dock grows in a wide variety of habitats, including disturbed soil, waste areas, roadsides, fields/meadows, shorelines, and forest edges. It is widely naturalised throughout the temperate world and has become a serious invasive species in many areas, including throughout North America, southern South America, New Zealand and parts of Australia.
It is classified as an “injurious weed” under the UK Weeds Act 1959. It is often seen in disturbed soils at the edges of roadsides, railway beds, and car parks.