Wondering “will MSMA kill Virginia buttonweed?” is a common question among homeowners and lawn care professionals dealing with this aggressive, hard-to-control weed. Virginia buttonweed is one of the most challenging lawn weeds to manage, and MSMA has been a go-to herbicide for many warm-season grass weeds. However, the effectiveness of MSMA on Virginia buttonweed is limited, and understanding why is essential for successful control.
Virginia buttonweed (Diodia virginiana) is a persistent perennial weed that plagues lawns throughout the southeastern United States. This creeping weed forms dense mats that choke out desirable turf grasses, and its deep root system and waxy leaves make it resistant to many common herbicides. Understanding which products effectively control Virginia buttonweed is crucial for maintaining a healthy lawn.
MSMA (monosodium methanearsonate) is an organic arsenical herbicide that has been widely used for controlling crabgrass, dallisgrass, and other grassy weeds in warm-season turf. However, Virginia buttonweed is a broadleaf weed, and MSMA is primarily effective on grassy weeds, making it a poor choice for buttonweed control.
This comprehensive guide examines whether MSMA kills Virginia buttonweed, explores why it is ineffective, and provides expert recommendations for effective Virginia buttonweed control using the right products and techniques.
What Is Virginia Buttonweed?
Identification
Virginia buttonweed is a creeping, perennial broadleaf weed that forms dense mats in lawns, particularly in warm-season grasses like bermudagrass, zoysiagrass, and St. Augustinegrass. Key identification features include:
- Leaves: Opposite, narrow, lance-shaped leaves with prominent veins, 1-2 inches long
- Stems: Creeping, rooting at nodes, forming dense mats
- Flowers: Small, white, star-shaped flowers with four petals
- Root system: Extensive, deep root system with creeping rhizomes and fibrous roots
- Growth habit: Low-growing, spreading form that chokes out desirable turf
Why Virginia Buttonweed Is So Difficult To Control
- Deep root system: Virginia buttonweed has an extensive root system that allows it to survive drought and regenerate after herbicide application
- Waxy leaf surface: The waxy cuticle on leaves repels many herbicides, reducing absorption
- Creeping growth habit: The plant spreads through stolons and rhizomes, forming dense mats
- Prolific seed production: Virginia buttonweed produces numerous seeds that can remain viable in soil for years
- Herbicide resistance: This weed has developed resistance to several common herbicides, making control challenging
Will MSMA Kill Virginia Buttonweed?
The Short Answer
No, MSMA is not effective for controlling Virginia buttonweed. MSMA is a selective herbicide primarily used for controlling grassy weeds like crabgrass, dallisgrass, and nutsedge in warm-season turf. Virginia buttonweed is a broadleaf weed, and MSMA does not provide effective control of broadleaf species.
Why MSMA Is Ineffective Against Virginia Buttonweed
- Different weed type: MSMA is formulated to target grassy weeds, not broadleaf weeds. Virginia buttonweed is a broadleaf plant with a different physiology than grasses
- Poor absorption: The waxy leaf surface of Virginia buttonweed prevents MSMA from being absorbed effectively
- Insufficient translocation: Even if MSMA is absorbed, it does not translocate effectively to the root system of broadleaf weeds
- Label restrictions: MSMA is not labeled for Virginia buttonweed control, and using it off-label is not recommended
- Waste of resources: Applying MSMA to Virginia buttonweed wastes time, money, and effort while providing no control benefit
What Actually Kills Virginia Buttonweed?
1. Dicamba – Most Effective Broadleaf Herbicide
Dicamba is one of the most effective herbicides for controlling Virginia buttonweed. This systemic broadleaf herbicide is absorbed through leaves and roots, providing excellent control of this persistent weed. Dicamba works by disrupting plant growth hormones, causing distorted growth and eventual death.
Apply dicamba when Virginia buttonweed is actively growing in spring or fall for best results. Multiple applications may be necessary for complete control. Use caution around desirable plants, as dicamba can drift and affect sensitive species.
2. 2,4-D – Effective Combination Herbicide
2,4-D is another effective herbicide for Virginia buttonweed control. Often used in combination with dicamba or triclopyr, 2,4-D provides excellent control of this persistent weed. The combination of active ingredients provides broader control and reduces the risk of resistance development.
Apply combination products containing 2,4-D, dicamba, and sometimes triclopyr for comprehensive control. Follow label instructions carefully and apply when weeds are actively growing.
3. Triclopyr – Excellent Broadleaf Control
Triclopyr is a systemic herbicide that provides excellent control of broadleaf weeds, including Virginia buttonweed. This herbicide is absorbed through leaves and translocated to the root system, providing complete plant kill. Triclopyr is particularly effective when combined with other broadleaf herbicides.
Apply triclopyr products as directed, following label instructions for specific turfgrass types. Use caution around desirable plants, as triclopyr can affect sensitive species.
4. Quinclorac – Effective On Buttonweed
Quinclorac is a selective herbicide that is effective on Virginia buttonweed when applied at the right rate and timing. This herbicide works by inhibiting cell wall biosynthesis, causing plant death. Quinclorac is particularly effective when combined with other broadleaf herbicides.
Apply quinclorac products as directed, following label instructions for specific turfgrass types. The best results are achieved when quinclorac is applied during active growth in spring or fall.
Recommended Herbicides For Virginia Buttonweed Control
1. Celsius WG – Best Overall Herbicide
Celsius WG is a premium herbicide that provides exceptional control of Virginia buttonweed and other broadleaf weeds. This product contains three active ingredients (thiencarbazone, iodosulfuron, and dicamba) that work synergistically to provide comprehensive control. The systemic action ensures complete plant kill, including the root system.
Apply Celsius WG when Virginia buttonweed is actively growing for best results. The product is safe for use on most warm-season turfgrasses when applied according to label instructions. This is widely considered the most effective option for Virginia buttonweed control.
2. Image Kills Nutsedge & Broadleaf Weeds
Image is a popular product that provides effective control of Virginia buttonweed and other broadleaf weeds. This product contains imazaquin, a systemic herbicide that is absorbed through leaves and roots. Image is particularly effective when applied during active growth in spring and summer.
Apply Image as directed, following label instructions for specific turfgrass types. Multiple applications may be necessary for complete control. Use caution around desirable plants, as imazaquin can affect sensitive species.
3. Blindside – Excellent Broadleaf Control
Blindside is a selective herbicide that provides excellent control of Virginia buttonweed and other broadleaf weeds. This product contains a combination of active ingredients that work together to provide comprehensive weed control. Blindside is particularly effective on hard-to-control broadleaf weeds.
Apply Blindside when weeds are actively growing for best results. The product is safe for use on most warm-season turfgrasses when applied according to label instructions. Multiple applications may be necessary for complete control.
Cultural Control Methods For Virginia Buttonweed
- Maintain a thick, healthy lawn: Proper mowing height (2.5-3.5 inches), regular fertilization, and adequate irrigation promote grass growth that outcompetes weeds
- Proper mowing: Mow at the correct height for your grass type and avoid scalping. Remove grass clippings if they contain weed seeds
- Core aeration: Core aeration reduces soil compaction and improves grass root growth, making turf more competitive against weeds
- Overseeding: Overseeding bare areas with desirable grass varieties helps fill spaces where weeds can establish
- Manual removal: For small infestations, hand pulling or digging can be effective, but ensure the entire root system is removed
Why MSMA Is Still Used In Lawn Care
MSMA remains a popular herbicide for controlling grassy weeds in warm-season lawns, particularly for crabgrass and dallisgrass. Its effectiveness on these specific grassy weeds makes it valuable in integrated weed management programs. However, its use is limited to grassy weed control, and it should never be relied upon for broadleaf weed control.
When using MSMA, always follow label instructions carefully and apply only to the specific grassy weeds it is designed to control. Never assume that MSMA will control broadleaf weeds like Virginia buttonweed, as it simply will not provide effective control.
Frequently Asked Questions About Virginia Buttonweed Control
1. Will MSMA kill Virginia buttonweed?
No, MSMA is not effective for controlling Virginia buttonweed. MSMA is a selective herbicide for grassy weeds, while Virginia buttonweed is a broadleaf weed. Use broadleaf herbicides like dicamba, 2,4-D, or triclopyr for effective control.
2. What is the best herbicide for Virginia buttonweed?
Celsius WG is widely considered the best herbicide for Virginia buttonweed, containing three active ingredients that work together to provide comprehensive control. Dicamba, 2,4-D, and triclopyr are also effective options.
3. How do I identify Virginia buttonweed?
Virginia buttonweed has opposite, narrow, lance-shaped leaves with prominent veins, creeping stems that root at nodes, and small white, star-shaped flowers with four petals. It forms dense mats in warm-season lawns.
4. When is the best time to apply herbicide for Virginia buttonweed?
The best time to apply herbicide for Virginia buttonweed is in spring or fall when the weed is actively growing. Multiple applications may be necessary for complete control.
5. Can I prevent Virginia buttonweed from returning?
Maintaining a thick, healthy lawn through proper mowing, watering, and fertilization is the best prevention. Regular monitoring and prompt removal of new weeds prevents establishment.
6. Is Virginia buttonweed resistant to herbicides?
Virginia buttonweed has developed resistance to some herbicides, making control challenging. Using combination products and rotating active ingredients helps prevent resistance development.
7. How long does it take to kill Virginia buttonweed?
Most herbicides take 7-14 days to show visible results, with complete control taking 3-4 weeks. Multiple applications may be necessary for complete eradication.
Conclusion
Will MSMA kill Virginia buttonweed? The answer is no. MSMA is a selective herbicide designed for grassy weeds, and Virginia buttonweed is a broadleaf weed that requires different active ingredients for effective control. Understanding this distinction is essential for successful weed management and preventing wasted time, money, and effort.
Virginia buttonweed is one of the most challenging lawn weeds to control, with its deep root system, waxy leaves, and creeping growth habit making it resistant to many common herbicides. Effective control requires using the right products at the right time, often in combination with cultural practices that promote healthy turf growth.
For successful Virginia buttonweed control, choose broadleaf herbicides like dicamba, 2,4-D, triclopyr, or combination products like Celsius WG. Apply these products when weeds are actively growing, and be prepared for multiple applications over several seasons for complete control.
Ready to effectively control Virginia buttonweed in your lawn? Choose the right herbicide for the job, follow label instructions carefully, and maintain a healthy lawn to prevent future infestations. Your efforts will reward you with a beautiful, weed-free lawn.