Yarrow (Achillea millefolium) is a resilient perennial weed that invades lawns, spreading quickly through seeds and rhizomes. While it has decorative and herbal value, its aggressive growth threatens turf health and density. Choosing the right herbicide helps eradicate yarrow without damaging your grass.

Many common weed killers are ineffective against yarrow, so targeted systemic herbicides are essential. These products travel through the plant to the roots, ensuring total kill. Timing and correct application are also critical to success.

This guide reviews the top 10 best weed killers for yarrow based on potency, grass safety, affordability, and ease of use. Whether you’re managing a small patch or a widespread lawn infestation, these options provide lasting results. Read on to find the right solution for your yard.

Top 10 Weed Killers for Yarrow

1. Ortho WeedClear Lawn Weed Killer

This selective herbicide combines 2,4-D, quinclorac, and dicamba to control tough weeds like yarrow. It targets roots and is safe for most lawn grasses. The systemic action prevents future regrowth.

It becomes rainproof in just one hour and shows visible results within days. The hose-end sprayer covers large lawns easily. Ideal for use during active weed growth in spring or fall.

Avoid applying on newly seeded areas or right after mowing. Keep pets and kids off the lawn until dry. Store the product securely after each use.

2. Southern Ag Amine 2,4-D Weed Killer

Southern Ag’s Amine 2,4-D offers a cost-effective option for killing yarrow and other broadleaf weeds. It works well when mixed with water and applied using a handheld or backpack sprayer. Suitable for both turf and pasture applications.

Results appear in about a week when temperatures are warm. Reapply if the infestation persists over time. The formula penetrates roots for long-term impact.

Wear gloves and eye protection while mixing and spraying. Keep children and animals away from the treated area until dry. Avoid windy days to prevent spray drift.

3. BioAdvanced All-in-One Lawn Weed & Crabgrass Killer

BioAdvanced uses a combination of 2,4-D, quinclorac, and dicamba to kill stubborn weeds like yarrow. It’s designed for both warm- and cool-season grasses. The all-in-one action also tackles crabgrass.

The spray is rainproof within one hour and delivers visible changes in two to three days. It’s perfect for lawns with multiple weed problems. For best results, apply when temperatures are under 85°F.

Avoid mowing the lawn a day before and after treatment. Always follow label instructions closely. Refrain from applying during drought stress.

4. Tenacity Herbicide

Tenacity features mesotrione, which provides both pre-emergent and post-emergent weed control. It’s safe for many grass types and highly effective against yarrow. The formula works systemically and prevents regrowth.

Apply with a non-ionic surfactant for maximum impact. Expect whitening of the weed as a visible sign of effectiveness. Rainproof in one hour, it fits well into lawn renovation plans.

Mix and apply using a tank sprayer. Avoid applying during extreme heat or windy days. Protective gear is recommended during use.

5. Roundup For Lawns (Selective Formula)

This Roundup version is safe for lawns and effective against weeds like yarrow. It includes MCPA, quinclorac, and dicamba for comprehensive weed control. Ideal for both northern and southern turf varieties.

The ready-to-spray container is easy to use and covers medium to large lawns. It becomes rainproof in three hours and starts working quickly. Suitable for homeowners who want a convenient option.

Don’t use this near flower beds or vegetable gardens. Keep the bottle upright when storing. Use gloves and safety glasses while spraying.

6. Spectracide Weed Stop for Lawns

Spectracide provides an affordable weed killer that works well against yarrow. It contains a three-way blend of active ingredients for broadleaf control. It’s best applied during the active growing season.

You can expect to see results in five to seven days. It’s rainproof after six hours and works for spot or full-lawn treatments. The concentrate and spray versions give application flexibility.

Don’t mow before or right after using the product. Always wear protective clothing when handling chemicals. Store in a cool, dry location.

7. Gordon’s SpeedZone Lawn Weed Killer

SpeedZone is a fast-acting solution for tough weeds like yarrow. It contains four active ingredients for enhanced penetration and effectiveness. Suitable for use in cool weather conditions.

You’ll start seeing weed response in just 24 to 48 hours. It’s rainfast in two hours and allows reseeding within two weeks. Covers large lawns with minimal product.

Avoid spraying near flower beds. Use a calibrated sprayer for best accuracy. Wear gloves and eye protection during application.

8. Hi-Yield 2,4-D Selective Weed Killer

Hi-Yield is a straightforward 2,4-D herbicide that works well on yarrow. It’s affordable and can be used over wide areas. Best applied during calm weather for even coverage.

Mix it with water and apply using a sprayer. Expect results in seven to ten days. Works on both residential lawns and pastures.

Keep people and pets off the lawn until it dries. Follow dilution instructions carefully. Don’t use around edible plants.

9. Natural Armor Weed & Grass Killer

This natural formula uses vinegar to kill weeds like yarrow on contact. It’s a good choice for patios, walkways, and edges. It’s not systemic, so root systems may survive.

Results appear within a few hours under sunny conditions. Easy to use straight from the bottle. Repeated applications may be needed for full control.

Use caution to avoid overspray on grass. This is not rainproof and should be reapplied after wet conditions. Keep it out of reach of children.

10. RM43 Total Vegetation Control

RM43 is a strong, non-selective weed killer for long-term control in non-lawn areas. It combines glyphosate and imazapyr to prevent regrowth for up to a year. Use it for driveways, fence lines, or gravel paths.

Apply directly to dry foliage and avoid rainfall for 48 hours. You’ll see visible dieback in a few days. Don’t use this in areas where you want plants to regrow.

Always wear full PPE when applying. Follow environmental guidelines strictly. Keep away from water sources and drains.

Buyer’s Tips for Yarrow Weed Control

1. Use systemic herbicides: These travel to roots, killing the entire plant.
2. Apply during active growth: Spring and fall are ideal seasons.
3. Repeat if needed: Yarrow may require multiple treatments.
4. Spot treat carefully: Minimize impact on nearby plants.
5. Choose turf-safe products: Confirm compatibility with your grass type.
6. Water as directed: Some products need water, others do not.
7. Wear protective gear: Gloves and goggles are essential for safety.

7 Frequently Asked Questions (FAQs)

1. Is yarrow hard to kill? Yes, due to its underground rhizomes and resistance to common herbicides.
2. What time of year should I treat it? Spring and fall offer the best results.
3. Can vinegar kill yarrow? It burns foliage but doesn’t kill the root.
4. Should I mow before applying herbicide? No, wait at least 2–3 days before and after application.
5. How long before I see results? Most products show effects in 3–10 days.
6. Is yarrow toxic to pets? Yes, it can cause skin and digestive issues in animals.
7. Will the weed come back? If not fully killed, yarrow often regrows and spreads fast.

Conclusion

Yarrow is a tough weed, but not unbeatable with the right approach. Systemic herbicides like Ortho WeedClear and Tenacity provide reliable results when applied during active growth seasons. Repeat applications and good lawn practices ensure long-term control. Always follow safety measures and product guidelines. With persistence and the right product, your lawn can be free of yarrow.