It has numerous common names, including common yellow oxalis, sour grass, shamrock, sleeping beauty, sour trefoil, and sheep’s clover. Yellow woodsorrel thrives in moist fertile soils but grows under a wide range of conditions. What is oxalis? Although small, it’s tricky to pull out and the roots usually stay where they are and it will regrow from them. Symptoms. It is easily distinguished from clover by the 3 heart-shaped leaflets found on top of each long stalk (or petiole) and 5-petaled yellow flowers that bloom from spring through summer. Management In Lawns. Yellow Wood Sorrel (Oxalis stricta), commonly called Oxalis or sour grass, is a vigorous weed. Oxalis, also known as wood sorrel, is a perennial weed that is often mistaken for clover. Yellow sorrel, Oxalis corniculata, is a low, creeping weed that will happily grow anywhere – it’s as happy in the bone-dry cracks in paving as it is in the damp garden and around the tops of containers. Mechanical Management Hand pulling or using an appropriate weeding tool are the primary means of mechanical weed control in lawns. Common name Wood sorrel, yellow sorrel, pink sorrel or pink shamrock Botanical name Oxalis corniculata, O. debilis, O. latifolia Areas affected Beds, borders and lawns Main causes Spreads via bulbils and seed Timing Seen and treated in summer Jump to. Flowers are bright yellow, have five petals, and bloom in early spring (March to April). Advertisement . Cultural practices Maintain healthy, dense turf that can compete and prevent weed establishment. It is a summer annual -- sometimes perennial -- that thrives in fertile, warm and moist soils and likes shade. Control; What is oxalis? See more pictures of Oxalis here. Yellow Wood Sorrel Oxalis stricta Lawn Weed Identification and Control. Appearance; How does oxalis spread? Wood sorrel is a troublesome weed that is difficult to control, especially in mild climates were it blooms year-round. The plant has a shallow taproot, and hairy stems that are 4 to 10 inches tall. Although attractive looking, with several species such as … Also known as Oxalis stricta, yellow wood sorrel can be hard to tame because it grows year-round in milder climates.Yellow wood sorrel is related to a variety of other oxalis species, all of which can be problems in the garden and lawn. Yellow woodsorrel is an herbaceous perennial common in greenhouse and turf situations. The fruit is a narrow capsule Weeds can be a problem in an organic garden and yellow wood sorrel weed is no exception.

Common yellow woodsorrel, Oxalis stricta, is a native North American plant (also found in Eurasia) which is usually considered a weed. It is most recognizable due to the heart-shaped leaflets that are found three to a leaf.