Common sorrel or garden sorrel (Rumex acetosa), often simply called sorrel, is a perennial herb in the family Polygonaceae. Other names for sorrel include spinach dock and narrow-leaved dock. It is a common plant in grassland habitats and is cultivated as a garden herb or leaf vegetable (pot herb). Common sorrel has been cultivated for centuries. The leaves may be puréed in soups and sauces or added to salads; they have a flavour that is similar to kiwifruit or sour wild strawberries. The plant's sharp taste is due to oxalic acid. In small quantities sorrel is harmless; in large quantities it can be fatal.