Yellow Woodsorrel is a broadleaf, annual herb that also grows perennially and belongs to the family “Oxalidaceae” in the Genus “Oxalis”. Yellow Woodsorrel is commonly a weed of grassy lawns, gardens, and fields, including meadows, woodlands, and disturbed areas in most North America. It prefers to grow in the full sun But, survives partial shade. It grows on both moist and dry soils with higher pH values and prefers both sandy and loamy soils. The soil fertility is not a hindrance in growing Yellow Woodsorrel, and it can establish on low fertility soils. The leaves and flowers are edible and used for making an orange dye after boiling the entire plant. Yellow Woodsorrel succeeds in growing up to 8200 feet above sea level.
Yellow Woodsorrel is a cosmopolitan herb that is native to Eurasia and North America. It is also among the widest spreader turf weeds that compete with them for nutrients and moisture. It also grows at disturbed and neglected locations in meadows and woodlands across the US. Due to its aggressive growth patterns, it can grow in low fertility soils, where it soon becomes a violent weed in turfgrasses and garden beds. It boosts growth in spring and fall whereas, it can grow year-round in a warmer climate. Its colonies exist in 46 states but, Eastern US and Canada support its triggering growth.
The leaves of Yellow Woodsorrel are arranged alternately on the stem. Usually, the leaves have long petioles. Leaves form a palmate structure when they divide into 3-leaflets having faintly hairy margins. Leaflets measure about 1 to 2 cm in length. No stipules are present. Stems may be ascending or erect that measure up to 50 cm in height. Stems contain multi-cellular long, crooked, and soft hairs. Yellow flowers emerge from the leaf axils that range between 5-7 per terminal. Flowers consist of erect seed pods enclosed in yellow petals measuring between 5 to 9 mm in length. Seed pods measure up to 15 mm in length with septate hairs.
Yellow Woodsorrel exists as an annual plant and sometimes a short-lived perennial depending on the type of climates it grows. Propagation takes place both by seed and underground stems. As seed pods exist at a right angle with the stems that contain five chambers, and each chamber holds 10 seeds. On ripening, the seed pods open with an explosion by a minor disturbance and launch the seeds to 10 feet distance. Seed germination may happen in the same year or upcoming spring. Additionally, Yellow Woodsorrel forms colonies from the rhizomes whereas, the majority of the population grows from the seeds.
Maintaining a healthy and dense turf could compete and prevent Yellow Woodsorrel in lawns. Hand pulling or weeding are the most successful methods to prevent infestation when the Yellow Woodsorrel is in the 4th to 6th week of growth before forming capsules that contain seed. Once established, it is difficult to eradicate all stolon from the turfgrasses. Hand-weeding and Hand -pulling need sufficient moisture to confirm that the entire plant removes. Remove plant debris, stolon, and rhizomes from the field safely to avoid germination.
It mixes Glyphosate (73.3%) with Diquat dibromide (2.9%), and both ingredients are from the non-selective herbicides category. Diquat is pretty quick at burning and magic behind this product whereas, Glyphosate is a slow reactor that takes nearly 10 days to target weeds but, higher temperature triggers its performance. Together they make an excellent formulation that kills everything that comes under their coverage. Use only the patios, walkways, and bare areas where you don’t need vegetation. If a lawn is being prepared for planting turfgrasses, use at least one month before planting them.
Each 1.5-ounce sachet is added to one gallon of water to target undesired plants including, Yellow Woodsorrel.
If Yellow Woodsorrel is a permanent issue in your turfgrass Scotts WeedEx is a proven pre-emergent formula that contains 1.71% of Pendimethalin in this ready-to-use product that could prevent Yellow Woodsorrel during its active growing period. The best to apply Scotts WeedEx is early spring that could keep you free of all broadleaf weeds for the next three or four months. Additionally, it applies to all types of turf except for Dichondra and Bentgrass.
10-Pounds of Scotts WeedEx Granular can be spread over up to an area of 5000 square feet to target many broadleaf weeds including, Yellow Woodsorrel. Additionally, the gardeners can also apply it on garden beds before planting vegetables.
Weed Beater Ultra contains (31.55%) MCPA, (6.16%) Mecoprop-p, (0.22%) Carfentrazone, and (1.65%) Dicamba which is an excellent combination for both Northern and Southern turf types. This combination will work on existing weeds that are growing actively besides suppressing sprouting from the seed. However, it targets most of the broadleaf weeds including, Yellow Woodsorrel and other Oxalis species that grow in the turfgrasses. The product is a good fit for applying in early spring that could repeat in the summer and early autumn. Complete control may take two weeks but, burning could start immediately.
Add 3 ounces of the concentrated product in one gallon of water to target Yellow Woodsorrel and other broadleaf weeds in turf.
Ortho WeedClear is another promising blend that mixes 2,4-D, Mecoprop-p, and Dicamba that is available in concentrated form. Preferably it applies in early spring and repeats at least observing two weeks' interval if required. A concentrated product is more effective than the pack sizes that offer additional Dial N Spray or a Wand. It targets the majority of broadleaf weeds including, Yellow Woodsorrel, Clover, and Chickweed. The product is also safe for the majority of turfgrasses except for a few exceptions.
Add 2 ounces of the concentrated product in one gallon of water for spray coverage of 1000 square feet of turf.
Learn How to control and get rid of other weeds in our complete Yard Weeding Guide.
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