The flowers are small and buttery yellow with five petals and the leaves grow in clusters. Control. It also tends to grow in a more upright fashion than other wood sorrels (stricta means “upright”). The flowers have five petals and can be found throughout the growing season. DeFelice. Herbicide Rates: Rates used in this trial are listed in OMAF Publication 75 - Guide to Weed Control. Black medic does have yellow flowers, but tiny individual flowers … The type of Oxalis that shows up in turfgrass is also known as Yellow or Creeping Wood-Sorrel, and can be tricky to control. For information in Table 2, common yellow wood-sorrel was at the 3rd to 6th trifoliate stage. Common yellow woodsorrel is distinct from other wood sorrels in that the seed pods bend sharply upward on their stalks and the stalks also grow at a sharp angle from the main stalk (both angles are about 90 degrees). By: Susan Patterson, Master Gardener Printer Friendly Version. It's fairly easy to control in the lawn by spot-spraying with an herbicide labeled for broadleaf weed control in lawns. 2009. Largest genus in the wood-sorrel family Oxildaceae. In France it is called pain de coucou. More than 800 different varieties of the plant have been identified. Family: Oxalidaceae (wood sorrel family). Yellow Woodsorrel looks like a clover, with heart-shaped leaves that fold up during the night. Weed Stage: For information in Table 1, common yellow wood-sorrel had not emerged yet. This plant is also known as sheep, horse, cow, field, or mountain sorrel and even sour dock. The bulbs are hard to get rid of, and can easily be spread when the soil is disturbed or by the plant as it spreads. Description: The leaves of this plant are pale green and divided into three heart-shaped leaflets, somewhat like clover. Species Description. Bryson, C.T. Also, the leaflets of yellow woodsorrel are a pronounced heart-shape. Oxalis, also known as wood sorrel, looks very similar to another weed called Clover, with the signature three-parted rounded leaves. Sorrel Weed Control: How To Control Yellow And Red Sorrel Weeds. This week can actually be confused with clover when it's not in flower. Oxalis or yellow woodsorrel (Oxalis stricta) is an annual plant with clover-shaped leaves and yellow or pink flowers. and M.S. A member of the wood sorrel family, oxalis is a weed commonly found in lawns. Weeds. Dicamba or 2,4-D provide postemergence control of large plants. Life Span: Cool-season (spring and fall) perennial that persist year-round in warmer climates, annual in cooler climates. Image by Jacob Enos. How can you tell if your weed is Yellow Woodsorrel? Here's how you tell them apart: Clover has rounded leaflets in sets of 3, whereas oxalis has heart-shaped leaflets in sets of 3. Other Common Names: Yellow woodsorrel, yellow oxalis, upright yellow sorrel, shamrock, lucky clover, good luck plant. A telling difference is that oxalis gets little yellow flowers. Class: Dicotyledonous plant. There are several types of oxalis that grow as hard-to-kill weeds in New Zealand. About Oxalis – While not all species of Oxalis are considered weeds, once it has taken residence in your lawn it becomes one. Where soil has poor drainage and low nitrogen, you will undoubtedly find sorrel weeds (Rumex spp). Oxalis can grow between 6 to 12 inches tall and have unique shamrock-shaped leaflets in various color combinations including ones with speckles. Commonly called yellow woodsorrel, ladies' sorrel, oxalis, sheep sorrel, yellow oxalis, upright yellow-sorrel, lemon clover, pickle plant, sour trefoil, stickwort, and fairy bells. However, woodsorrel has yellow flowers, not white. Identifying Yellow Wood Sorrel. Most are fairly low growing and have small bulbs in the ground. All parts of yellow woodsorrel are edible, but the plant contains toxic properties that can cause renal disease, metabolic tetany, depression, and other disorders. Pendimenthalin is a residual herbicide effective for yellow woodsorrel control.