Also known as yellow-sorrel, woodsorrel is a low-growing herbaceous plant with a narrow, creeping stem. The leaves are divided into three heart-shaped leaflets. The yellow flowers have five petals and grow in clusters from June to September. The fruit is a narrow capsule between 1 and 2 centimetres long, which fires out small seeds when touched.
Woodsorrel grows on arable land and waste ground and is a common garden weed. It cannot grow in the shade and requires dry or moist soils. It is widely spread throughout Europe but is rare in the north.