Common Sorrel is a common, upright plant, often found in grasslands and along woodland edges and roadside verges. It has slender leaves and attractive flowers that appear in May and June, peppering the green grasses of our meadows with crimson and pink. Its numerous other common names, from ‘Sour Ducks’ to ‘Vinegar Plant’, all allude to the fact that its leaves taste extremely tart and dry due to their high levels of oxalic acid.