Photo: James H. Miller & Ted Bodner, Southern Weed Science Society, Bugwood.org
However, woodsorrel has yellow flowers, not white. The flowers have five petals and can be found throughout the growing season. Also, the leaflets of yellow woodsorrel are a pronounced heart-shape. Black medic does have yellow flowers, but tiny individual flowers are clustered together and resemble one flower.
The leaflet petioles of woodsorrel are much longer than the leaflets themselves, which is not the case for clovers and black medic. It is a low growing perennial that can be found in lawns and in gardens. Woodsorrel reproduces primarily from seeds, though it does produce rhizomes too. The seeds explode out of a capsule and can travel 12 feet! It prefers moist, partially-shaded soil, but will grow in a variety of conditions.
Woodsorrel has an extensive, fibrous root system along with the rhizomes. However, plants can be hand removed in beds, but it is time consuming, which makes it impractical for commercial businesses. Mulch is an excellent method for woodsorrel management. Seeds cannot get established when they are not in contact with the soil.
There are a number of pre-emergent and post-emergent herbicides.
- glyphosate (all are non-selective)
- combination products of 2,4-D, MCPA and dicamba, fluroxypyr, mesotrione and others.