Yellow Woodsorrel (Oxalis)
Oxalis stricta
Yellow Woodsorrel (Oxalis) (Oxalis stricta) is a perennial broadleaf weed characterized by three heart-shaped leaflets resembling clover; small bright yellow flowers with 5 petals; explosive seed pods.. It anchors via a creeping stolons root system and is selectively controlled using Triclopyr or Fluroxypyr (Post-emergent); Isoxaben (Pre-emergent) applied during spring through early summer before explosive seed capsules mature..
Triclopyr or Fluroxypyr (Post-emergent); Isoxaben (Pre-emergent)
Three heart-shaped leaflets resembling clover; small bright yellow flowers with 5 petals; explosive seed pods.
Always read and follow the manufacturer's EPA-approved pesticide product label. The label is the law under federal FIFRA (Federal Insecticide, Fungicide, and Rodenticide Act) regulations. Application rates, personal protective equipment (PPE), target weed maturity stages, temperature restrictions, and grazing or re-entry intervals specified on the EPA container label supersede all online recommendations. Local state regulations may restrict certain active ingredients.
University-Verified Herbicide Formulations
Professional active formulations cross-referenced against university weed science trials.
Tenacity Herbicide (Mesotrione 8 oz)
Active: 40% Mesotrione Selective Systemic
Gold standard selective pre- and post-emergent targeting crabgrass, ground ivy, yellow nutsedge, and clover during overseeding.
SedgeHammer+ Turf Herbicide (Halosulfuron 0.5 oz)
Active: 5% Halosulfuron-methyl with Surfactant
Pre-mixed with surfactant for 1-gallon sprayers. Translocates into underground nutlets without injuring cool or warm season lawns.
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Botanical Identification Key for Yellow Woodsorrel (Oxalis)
Accurately identifying Oxalis stricta is essential because spraying non-selective chemicals like glyphosate risks killing desirable lawn grass. Look for these botanical hallmarks:
- Foliar Morphology: Three heart-shaped leaflets resembling clover; small bright yellow flowers with 5 petals; explosive seed pods..
- Root Architecture: Anchored by a creeping stolons, making manual pulling ineffective unless the entire root crown is extracted.
- Growth Period: Active during perennial cycles, flourishing when lawn turf is stressed or cut too short.
Eradication Protocol & Selective Herbicide Selection
To eradicate Yellow Woodsorrel (Oxalis) while preserving your lawn turfgrass, apply Triclopyr or Fluroxypyr (Post-emergent); Isoxaben (Pre-emergent) during Spring through early summer before explosive seed capsules mature.. Ensure that the active ingredients match your host turfgrass tolerances:
- Temperature Safety Band: Apply when ambient air temperatures range between 65°F and 85°F. Never apply volatile ester herbicides in temperatures exceeding 85°F to prevent herbicide vapor drift and leaf burn.
- Adjuvant / Surfactant: For waxy or hairy weed foliage, mix with a methylated seed oil (MSO) or non-ionic surfactant according to EPA label instructions to enhance chemical cuticle penetration.
- Mowing Holdback: Do not mow the lawn 2 days prior to spraying or 2 days after application to maximize foliar surface area for chemical absorption.
Frequently Asked Questions About Yellow Woodsorrel (Oxalis)
01 How do I kill Yellow Woodsorrel (Oxalis) without harming my lawn?
Use a selective herbicide labeled for your specific turfgrass species containing Triclopyr or Fluroxypyr (Post-emergent); Isoxaben (Pre-emergent). Spray when Yellow Woodsorrel (Oxalis) is actively growing during spring through early summer before explosive seed capsules mature.. Always check your host grass in our weed triage tool before application.
02 Why does pulling Yellow Woodsorrel (Oxalis) by hand often fail?
Yellow Woodsorrel (Oxalis) anchors via a creeping stolons. Hand-pulling often breaks the crown or leaves underground root fragments, rhizomes, or nutlets behind, which triggers rapid regrowth. Systemic selective herbicides translocate down through the vascular tissue to destroy the entire root structure.
03 What class of weed is Yellow Woodsorrel (Oxalis)?
Yellow Woodsorrel (Oxalis) is classified botanically as a Broadleaf weed with a Perennial life cycle.
04 When is the best time of year to treat Yellow Woodsorrel (Oxalis)?
The optimal eradication window is Spring through early summer before explosive seed capsules mature.. Applying when temperatures are between 60°F and 85°F ensures maximum chemical absorption and prevents foliar heat stress to your desirable lawn.