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TYPE
Yellow wood sorrel or creeping sorrel is a part of the vast wood sorrel family. This weed is among the largest group of weeds, broadleaf perennials, and can range from 10-35cm high. Yellow wood sorrel’s root system is shallow but fibrous along the length of the pink rhizomes, or a continuously growing horizontal underground stem that puts out lateral shoots and adventitious roots at intervals.
HOW TO IDENTIFY
Yellow wood sorrel can be observed when small, yellow flowers form with five petals, reaching 1-1.5 cm wide. The stems can be green to purple and branching form the base are alternating leaves that have long petioles. The leaves resemble three distinctly heart-shaped leaflets. Overtime, seeds form in erect capsules that when ready, explosively eject up to twelve feet away.
- NOTE: Yellow wood Sorrel is often mistaken for black medic.
Wood Sorrel - Notice the heart-shaped leaflets
Black Medic
WHERE IT GROWS
This weed prefers fertile, warm, moist soil as well as partial shade but are capable of growing under a wide range of conditions. This weed can be spotted in turf, lawns, gardens, fields, nurseries as well as other landscaped areas.
GROWING SEASON
Grows in the month of May-October
HOW TO MANAGE
For cases where a wood sorrel invasion is less severe, pull the weed out by hand. To correct an invasive infestation, use a post-emergence herbicide. Overall, the best prevention method for wood sorrel and any invasive weed is to maintain healthy, dense turf with a strong root system by adopting a regular lawn care routine including fertilization, soil amendments, proper mowing
and watering
as well as aeration
and thatch management
practices.
DID YOU KNOW?
- Wood sorrel’s is an edible weed. Its genus name, Oxalis, is derived from the Greek word meaning acid, because of its acidic taste.
- There are roughly 850 wood sorrel species around the world, but about 20 species reside in North America. Among them that can be seen include the yellow wood sorrel, violet wood sorrel and redwood wood sorrel. NOTE: Although a post emergent or the hand pulling method can help conquer a wood sorrel issue, be sure to identify which wood sorrel species is invading your lawn in order to determine the best treatment. Check with your county extension agent to see if a certain wood sorrel species has been spotted in your area.
For professional fertilizers, humic and AMP-XC™ enriched products available, please visit TurfCare’s online Product Catalog.
For green industry professionals or others interested in ordering Turfcare products, please contact our Customer Service
to find a distributor near you.
References:
https://extension.umd.edu/hgic/lawns/lawn-weed-identification
http://www.ediblewildfood.com/wood-sorrel.aspx
https://gobotany.newenglandwild.org/species/oxalis/corniculata/
https://plants.usda.gov/core/profile?symbol=OXCO
http://ipm.ucanr.edu/PMG/WEEDS/creeping_woodsorrel.html
https://www.britannica.com/plant/Oxalis
Turf Care Supply - TurfReport Blog
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