Oxalis articulata, commonly known as pink wood sorrel, is a perennial plant valued for its ornamental appeal but also frequently appears as a garden weed. This species, also called pink oxalis or windowbox wood-sorrel, is widely distributed due to its adaptability. Its distinctive foliage and delicate pink blooms contribute to its widespread presence.
Identifying Pink Wood Sorrel
Pink wood sorrel has clover-like, trifoliate leaves with heart-shaped, glossy leaflets that fold downward at night or during adverse weather. The plant produces delicate pink to purplish-pink flowers, occasionally white or magenta, each with five petals often arranged in a star shape. These blooms appear in clusters on long, slender stalks and close at night. The plant grows low to the ground, forming dense, mounded clumps up to one foot tall. Beneath the surface, it develops bulb-like rhizomes or tubers, which are important for its persistence and spread.
Cultivating Pink Wood Sorrel
Pink wood sorrel thrives in locations with full sun to partial shade, with full sunlight promoting more vigorous growth and abundant flowering. In hotter climates, providing some afternoon shade can prevent stress. The plant prefers well-draining, moderately fertile soil. A neutral to slightly acidic soil pH is suitable for its growth.
Consistent moisture is preferred, but avoid overwatering to prevent root rot. Allow the soil to dry partially between waterings, and reduce watering during dormancy periods. For intentional cultivation, pink wood sorrel is commonly propagated by dividing its clumps or planting its bulb-like rhizomes or tubers. This is typically done in the spring or fall to ensure successful establishment.
Controlling Pink Wood Sorrel
As a weed, manual removal is an effective strategy. Dig out the entire plant, ensuring all bulbils and rhizomes are removed to prevent regrowth. Using a trowel to sift through surrounding soil can help locate any remaining underground structures. Discard removed plants and their parts away from garden beds, as they should not be added to compost heaps.
Cultural practices can also suppress its growth. Applying a two to three-inch layer of organic mulch blocks light and deters new growth. Maintaining a healthy, dense turf or planting area reduces opportunities for pink wood sorrel to establish itself. Regular mowing can also contain its spread.
Chemical control can be considered for extensive infestations, though pink wood sorrel may develop resistance, necessitating repeat applications. Systemic herbicides are often more effective as they are absorbed by the foliage and translocated to the root system, providing a more thorough kill. Apply when plants are actively growing, and follow product instructions carefully to avoid harming desirable plants.
Uses and Important Considerations
Pink wood sorrel’s attractive foliage and delicate pink flowers make it suitable for borders, rock gardens, and containers. It also functions as a ground cover, providing a showy display of blooms. Beyond its aesthetic qualities, various parts of the plant, including leaves and flowers, are edible, offering a distinctive tangy or lemony flavor.
Pink wood sorrel contains oxalic acid, which imparts its characteristic sour taste. While edible, consumption should be in moderation, particularly for individuals with kidney stones or calcium deficiency. Ingesting large quantities can also be harmful to pets.