How to Effectively Eradicate Oxalis from Your Lawn

Oxalis, often called woodsorrel, is a persistent weed that frustrates many homeowners. Its ability to fling seeds up to 30 feet makes it especially difficult to control. If sprays and powders have failed, the problem is likely that the herbicide isn't adhering well to the weed's foliage.

Effective Control Strategy

The most reliable method for lawn oxalis is a two-step approach:

• Pre-wet the foliage – Lightly dampen the oxalis leaves before application. This helps the herbicide stick to the waxy foliage.
• Apply a post-emergent contact herbicide – Use a quality product like Scotts Turf Builder Weed & Feed (+2) or similar broadleaf weed killer. The wet foliage ensures better absorption and translocation to the roots.

Soil pH Adjustment

Oxalis thrives in acidic soils. Raising the pH discourages its return:

• Apply turf lime at a rate of 40 lbs per 1,000 sq ft.
• Test soil pH first; target a range of 6.0–6.5 for most cool-season grasses.

Persistence Pays Off

Because oxalis seeds prolifically, a single treatment rarely eliminates it completely. Repeat applications may be needed each season. Combine herbicide use with good lawn practices—mowing high, proper fertilization, and deep watering—to create dense turf that naturally outcompetes weeds.

With consistent effort, you can reclaim your lawn from this aggressive invader.