Lambsquarters is a fast-growing annual broadleaf weed that can quickly overtake gardens, lawns, and landscaped areas. Controlling it effectively requires timely herbicide applications, ideally when plants are small and actively growing.

This guide highlights the best herbicides for controlling lambsquarters, explains how each product works, and provides buyer tips and frequently asked questions to help gardeners and homeowners maintain weed-free spaces.

Top 10 Best Herbicide For Lambsquarters

1. Roundup Ready-to-Use Weed & Grass Killer III – Non-Selective Herbicide For Complete Lambsquarters Control

Roundup Ready-to-Use Weed & Grass Killer III kills lambsquarters down to the roots with its systemic action. It is effective on a wide range of weeds and grasses when sprayed directly on foliage. This product is ideal for use in non-crop areas, walkways, and garden beds before planting.

The ready-to-use spray requires no mixing and spreads evenly for consistent coverage. It is best applied on actively growing weeds under calm weather conditions. Multiple applications may be needed for dense infestations.

Homeowners prefer this product for its strong, reliable performance and ability to control tough weed populations quickly. It provides visible results within a few days. The formula is suitable for large or small outdoor areas.

2. SpeedZone Broadleaf Herbicide – Selective Herbicide For Lambsquarters In Lawns And Garden Edges

SpeedZone Broadleaf Herbicide targets lambsquarters and other broadleaf weeds while sparing most lawn grasses. It works best on actively growing plants and is effective on small infestations. Ideal for lawn edges, landscaped areas, and garden borders.

The product comes in a ready-to-use spray bottle for easy application. Its fast-acting formula starts working within days, reducing the need for repeated spraying. The herbicide provides selective control without harming turf when applied correctly.

Gardeners appreciate the precision and safety of this product in established lawns. It helps maintain the aesthetic of grassy areas while eliminating unwanted weeds. Regular use keeps lawns and landscaped beds clean and weed-free.

3. Ortho Weed B Gon Plus Crabgrass Control – Broadleaf Weed Killer For Lambsquarters

Ortho Weed B Gon Plus targets lambsquarters and other common broadleaf weeds in lawns and garden beds. The formula is safe for turf when applied according to instructions. Its systemic action ensures deep root control for lasting results.

This ready-to-use spray is easy to handle and requires no mixing. Visible weed decline typically occurs within a week after application. Repeat treatments are recommended for larger or established weeds.

Homeowners find it reliable for small to medium-sized lawn areas. The product is convenient and effective for spot treatments. It supports overall lawn health by selectively removing unwanted weeds.

4. Spectracide Weed & Grass Killer – Fast-Acting Contact Herbicide For Lambsquarters Foliage

Spectracide Weed & Grass Killer works by burning the foliage of lambsquarters and other weeds on contact. It is best used for small weeds or early infestations. The herbicide does not move to roots, so repeat applications may be necessary.

Ready-to-use spray allows for easy, precise application. Results are visible within hours to a few days. Care should be taken to avoid contact with desirable plants.

This product is ideal for homeowners seeking quick foliage control. It is perfect for driveways, walkways, and other non-planted areas. Regular monitoring and reapplication improve long-term weed management.

5. Bonide Weed Beater Plus – Ready-To-Use Broadleaf Herbicide For Lambsquarters

Bonide Weed Beater Plus eliminates lambsquarters and other broadleaf weeds on contact. It is suitable for use along garden edges, walkways, and landscaped beds. The formula acts quickly to desiccate weed foliage.

The ready-to-use trigger spray allows for convenient application. Weed decline is noticeable within a few days. Multiple treatments may be required for persistent weeds.

Homeowners value this product for its ease of use and effective performance. It is ideal for small to medium-sized areas. Consistent use helps maintain weed-free garden borders and beds.

6. Bonide Weed Beater Ultra – Fast-Acting Broadleaf Herbicide For Lambsquarters

Bonide Weed Beater Ultra quickly targets lambsquarters with its broadleaf herbicide action. It works best on small, actively growing plants. Ideal for spot treatments in garden beds, paths, and landscaped areas.

The ready-to-use spray allows for precise application. Foliage begins to brown and die within days. Repeat applications improve overall control for dense infestations.

Homeowners rely on this product for effective and safe weed removal. It preserves desirable plants when applied carefully. Regular use maintains healthy, weed-free landscaped spaces.

7. Pre-Emergent Herbicide (Pendimethalin/Prodiamine) – Weed Prevention For Lambsquarters Seedlings

Pre-emergent herbicides like pendimethalin and prodiamine prevent lambsquarters seeds from germinating. They create a protective barrier in the soil before weeds emerge. Effective application timing is critical for success.

These products are not effective on established weeds but provide long-term prevention. Apply in early spring or before planting beds. They reduce the need for repeated post-emergent treatments.

Ideal for gardeners and homeowners looking to prevent lambsquarters in flower beds, vegetable gardens, and landscaped areas. They work best combined with mechanical weed removal. Long-term soil protection helps maintain clean garden spaces.

8. Glyphosate Concentrate – Non-Selective Systemic Herbicide For Lambsquarters Control

Glyphosate is a powerful non-selective systemic herbicide that kills lambsquarters down to the root. Best used in non-planted areas or before establishing crops. It is highly effective on dense weed populations.

Mix with water as directed and apply to actively growing weeds. Avoid contact with desirable plants. Repeat applications may be needed for large infestations.

Homeowners and landscapers use glyphosate for thorough control of lambsquarters in walkways, driveways, and bare soil areas. Visible results appear within days. It provides strong long-term weed suppression.

9. 2,4-D Based Broadleaf Herbicide – Lawn-Safe Herbicide For Lambsquarters

2,4-D-based herbicides selectively target broadleaf weeds like lambsquarters while sparing grasses. Most effective when weeds are young and actively growing. Often combined with other broadleaf herbicides for enhanced efficacy.

Follow label instructions for application rates and timing. Use surfactants as recommended to improve absorption. Monitor treated areas and repeat as needed.

Ideal for maintaining healthy lawns while controlling lambsquarters. It prevents weed spread without damaging turfgrass. Regular use ensures long-term lawn quality.

10. Pelargonic Acid Contact Herbicide – Organic Contact Weed Killer For Lambsquarters

Pelargonic acid herbicides burn lambsquarters foliage on contact. Works best on small seedlings and weeds in non-crop areas. Provides fast visible results but limited root control.

Multiple applications may be necessary for full control. Avoid contact with desirable plants. Effective for patios, paths, and borders where selective control is not required.

Homeowners use this for quick control of lambsquarters and other weeds. It is safe for organic garden areas. Spot treatment maintains clean, weed-free spaces.

Buyer Guide Tips For Best Herbicide For Lambsquarters

Timing: Apply post-emergent herbicides when lambsquarters is small (under 4–6 inches) for maximum uptake and control.

Pre-emergent Options: Use pre-emergent herbicides to prevent seed germination before weeds appear.

Plant Safety: Non-selective herbicides kill all plants they contact. Apply carefully around desirable vegetation.

Repeat Applications: Some weeds require multiple treatments, especially if densely populated.

Follow Labels: Always read and follow product label directions for safe and effective application.

Best Herbicide For Lambsquarters (FAQs)

1. What is lambsquarters?

Lambsquarters (Chenopodium album) is an annual broadleaf weed common in gardens, lawns, and disturbed soils. It produces many seeds and spreads rapidly.

2. When should herbicides be applied?

Apply herbicides to small, actively growing lambsquarters for the best results. Larger weeds are harder to control.

3. Are pre-emergent herbicides effective?

Yes, pre-emergent herbicides prevent seeds from germinating, but must be applied before weed emergence.

4. Can glyphosate control lambsquarters?

Glyphosate kills lambsquarters effectively but is non-selective, so avoid contact with desirable plants.

5. Do selective herbicides harm lawns?

When used according to label directions, selective broadleaf herbicides will not harm turfgrass.

6. How many applications are needed?

Depends on infestation density; small seedlings often need only one application, but dense areas may require repeated treatments.

7. Can I use these herbicides near vegetables?

Only use products labeled safe for vegetable gardens. Avoid drift onto edible crops.

Conclusion

Effective lambsquarters control requires choosing the right herbicide, proper timing, and repeated monitoring. Systemic herbicides like glyphosate and selective broadleaf products are most effective when applied to young, actively growing weeds.

Pre-emergent herbicides help prevent future infestations, reducing labor and long-term maintenance. Contact herbicides are useful for spot treatments but may require multiple applications.

Following label instructions ensures plant safety, effective control, and lasting results. Regular monitoring and combination strategies improve overall weed management.

By selecting the appropriate herbicide for your situation, you can maintain a weed-free garden, lawn, or landscaped area. Consistency and proper technique are key to controlling lambsquarters successfully.