Herbicide For Purple Deadnettle: 20 Best Options For Total Control

Purple deadnettle is a winter annual broadleaf weed that emerges in fall, overwinters as a low rosette, and blooms in early spring with small purple flowers. It spreads rapidly through seeds and thrives in thin turf, garden beds, and no-till fields. Because it is a broadleaf species, selective broadleaf herbicides control it without harming most grasses.

Choosing the best herbicide for purple deadnettle depends on where the weed is growing, what stage it is in, and what surrounding plants you want to protect. Fall applications target seedlings before winter, while spring applications kill established plants before they set seed. Pre-emergent herbicides prevent germination in late summer and early fall.

Purple deadnettle is often found alongside henbit, chickweed, and speedwell, so identifying it correctly before treatment matters. It tolerates close mowing and poor soil, which is why it spreads quickly in stressed lawns and neglected garden beds. Improving turf density and soil fertility reduces future infestations.

In this guide, we review the best herbicides for purple deadnettle by examining pre-emergent and post-emergent options, application timing, and cultural practices for long-term control.

Herbicide For Purple Deadnettle: 20 Best Options For Total Control

1. 2,4-D Amine – Best Overall Herbicide For Purple Deadnettle

2,4-D amine is the best overall herbicide for purple deadnettle because it selectively controls broadleaf weeds without harming most turfgrasses and cereal crops. It is a synthetic auxin that causes uncontrolled cell division and twisting. It is absorbed through leaves and translocated throughout the plant.

2,4-D amine is used in lawns, sports fields, pastures, and cereal crops to control purple deadnettle and other winter annual broadleaf weeds. It works best when applied to actively growing weeds in fall or early spring before they set seed. It is often tank-mixed with dicamba or MCPP for broader spectrum control.

This product is easy to apply with a backpack or hose-end sprayer and requires careful calibration for even coverage. It is not safe around desirable broadleaf plants, so drift control is essential in mixed landscapes.

2. Dicamba – Best Herbicide For Purple Deadnettle In Crop Fields

Dicamba is a selective broadleaf herbicide that controls purple deadnettle and other tough winter annual weeds in lawns, pastures, and crop fields. It is absorbed through leaves, roots, and stems, making it effective under a wide range of conditions. It is often tank-mixed with 2,4-D for broader spectrum control.

Dicamba is used in lawns, fence rows, corn, and small grains to control purple deadnettle and other broadleaf weeds. It has some soil residual activity that extends control of germinating broadleaf weeds. It works best when applied to actively growing weeds in fall or early spring.

Dicamba is volatile and can drift long distances, damaging sensitive crops and garden plants. It is regulated in many states, with restrictions on timing and buffer zones.

3. MCPP – Best Herbicide For Purple Deadnettle And Clover

MCPP is a selective broadleaf herbicide that controls purple deadnettle, clover, and other winter annual weeds in lawns and turf. It is a synthetic auxin absorbed through leaves and roots and translocated through the plant. It is often used in combination with 2,4-D and dicamba.

MCPP is labeled for lawns, sports fields, and non-crop turf areas. It is particularly effective on clover and other legumes, making it a good option when both deadnettle and clover are present. It works best when applied to actively growing weeds in fall or early spring.

This product requires careful calibration and even coverage for consistent results. It is not safe around desirable broadleaf plants such as tomatoes, roses, and ornamentals.

4. Three-Way Broadleaf Herbicide – Best Ready-Mixed Herbicide For Purple Deadnettle Control

Three-way broadleaf herbicides combine 2,4-D, dicamba, and MCPP in a single formulation, providing broad-spectrum control of purple deadnettle and other winter annual weeds. They are absorbed through leaves and roots and act on multiple sites within the plant. They are widely used in turf management.

Three-way herbicides are labeled for lawns, sports fields, parks, and other turf areas. They control a wide range of broadleaf weeds including purple deadnettle, henbit, clover, and dandelion. They work best when applied to actively growing weeds in fall or early spring.

These products require careful calibration and even coverage for consistent results. They are not safe around desirable broadleaf plants, so drift control is essential in mixed landscapes.

5. Fluroxypyr – Best Fast-Acting Herbicide For Purple Deadnettle

Fluroxypyr is a selective broadleaf herbicide that acts quickly on purple deadnettle and other broadleaf weeds in turf and crops. It is absorbed through leaves and translocated to growing points, causing rapid distortion and decline of treated plants. It is often tank-mixed with 2,4-D or MCPP.

Fluroxypyr is labeled for turf, sports fields, and non-crop areas. It is particularly effective on clover, purple deadnettle, and other broadleaf weeds that are difficult to control with 2,4-D alone. It works best when applied to actively growing weeds during mild weather.

This product has limited soil residual activity, reducing the risk of damage to sensitive plants after application. It requires even coverage for consistent results.

6. Metsulfuron Methyl – Best Low-Rate Herbicide For Purple Deadnettle Control

Metsulfuron methyl is a selective ALS inhibitor that controls purple deadnettle and other broadleaf weeds at very low application rates. It is absorbed through leaves and roots and translocated to growing points, disrupting cell division. It is highly effective on many broadleaf species.

Metsulfuron methyl is labeled for turf, non-crop areas, and some crops. It controls purple deadnettle, henbit, and other broadleaf weeds when applied to actively growing plants. It works best when applied in fall or early spring during mild weather.

This product has significant soil residual activity that can affect sensitive broadleaf plants for months. It is not suitable for use where sensitive plants will be planted soon after application.

7. Carfentrazone – Best Contact Herbicide For Purple Deadnettle Burndown

Carfentrazone is a selective PPO inhibitor that causes rapid cell membrane disruption and desiccation of treated weeds, including purple deadnettle. It is absorbed through leaves and acts on contact, with symptoms appearing within hours. It is often tank-mixed with systemic herbicides for longer control.

Carfentrazone is labeled for turf, cereals, and non-crop areas. It is particularly effective on small broadleaf weeds like purple deadnettle and henbit when applied in tank mixes with other products. It works best on actively growing weeds with good spray coverage.

This product has limited soil residual activity and does not control grasses. It requires even coverage for effective results and works best on small, actively growing weeds.

8. Sulfentrazone – Best Herbicide For Purple Deadnettle And Sedges

Sulfentrazone is a selective PPO inhibitor that controls purple deadnettle, clover, and some sedges in turf. It is absorbed through roots and shoots and acts on contact, disrupting cell membranes. It has both pre-emergent and post-emergent activity.

Sulfentrazone is labeled for turf, including lawns, sports fields, and golf courses. It controls purple deadnettle, clover, and other broadleaf weeds when applied to actively growing plants. It is often tank-mixed with other herbicides for broader spectrum control.

This product has significant soil residual activity that contributes to its pre-emergent effect. It requires even coverage for effective results and works best on small, actively growing weeds.

9. Halosulfuron – Best Herbicide For Purple Deadnettle And Nutsedge

Halosulfuron is a selective ALS inhibitor that controls purple deadnettle, clover, and yellow nutsedge in turf. It is absorbed through leaves and roots and translocated to growing points, disrupting cell division. It is one of the few products that controls both broadleaf weeds and sedges.

Halosulfuron is labeled for turf, including lawns, sports fields, and golf courses. It controls purple deadnettle, clover, and yellow nutsedge when applied to actively growing plants. It works best when applied in fall or early spring.

This product has some soil residual activity that helps prevent new weeds from germinating. It is safe for most turfgrasses when applied according to label directions.

10. Penoxsulam – Best Low-Rate ALS Herbicide For Purple Deadnettle

Penoxsulam is a selective ALS inhibitor that controls purple deadnettle and other broadleaf weeds at low application rates. It is absorbed through leaves and roots and translocated to growing points, disrupting cell division. It is highly effective on many broadleaf species in turf.

Penoxsulam is labeled for turf, including lawns, sports fields, and golf courses. It controls purple deadnettle, clover, and other broadleaf weeds when applied to actively growing plants. It works best when applied in fall or early spring during mild weather.

This product has some soil residual activity that helps prevent new weeds from germinating. It is safe for most turfgrasses when applied according to label directions.

11. Prodiamine – Best Pre-Emergent Herbicide For Purple Deadnettle

Prodiamine is a pre-emergent herbicide that forms a soil barrier preventing purple deadnettle seeds from germinating. It is absorbed by emerging seedlings and disrupts cell division. It has no post-emergent activity on established plants.

Prodiamine is labeled for turf, including lawns, sports fields, and golf courses. It controls purple deadnettle and other winter annual weeds when applied in late summer or early fall before seed germination. It works best when applied to bare soil or thin turf before the fall flush.

This product has significant soil residual activity that prevents new weeds from germinating for months. It is safe for most turfgrasses when applied according to label directions.

12. Isoxaben – Best Pre-Emergent Herbicide For Purple Deadnettle In Landscape Beds

Isoxaben is a pre-emergent herbicide that prevents purple deadnettle seeds from germinating in landscape beds and around ornamentals. It is absorbed by emerging seedlings and disrupts cell wall formation. It has no post-emergent activity on established plants.

Isoxaben is labeled for landscape beds, ornamental plantings, and non-crop areas. It controls purple deadnettle and other broadleaf weeds when applied in late summer or early fall before seed germination. It works best when applied to bare soil or mulch before the fall flush.

This product has significant soil residual activity that prevents new weeds from germinating for months. It is safe for most ornamentals when applied according to label directions.

13. Atrazine – Best Herbicide For Purple Deadnettle In Corn And Sorghum

Atrazine is a selective herbicide that provides both pre-emergent and post-emergent control of purple deadnettle in corn and sorghum. It inhibits photosynthesis in susceptible plants and is absorbed through roots and leaves. It is one of the most widely used herbicides in North America.

Atrazine is labeled for corn, sorghum, and some non-crop areas to control purple deadnettle and other broadleaf weeds. It works best when applied in fall or early spring before seed germination and again after emergence. It is restricted in some states due to groundwater concerns.

This product has significant soil residual activity that helps prevent new deadnettle seedlings from emerging. It is a restricted-use product and must be applied according to label directions.

14. Metribuzin – Best Herbicide For Purple Deadnettle In Soybeans

Metribuzin is a selective herbicide that inhibits photosynthesis and provides both pre-emergent and post-emergent control of purple deadnettle. It is absorbed through roots and leaves and translocated to growing points. It is used in a range of crops including soybeans, cereals, and tomatoes.

Metribuzin is labeled for soybeans, cereals, and vegetables to control purple deadnettle and other broadleaf weeds. It works best when applied to actively growing weeds in fall or early spring. It is often tank-mixed with other herbicides for broader spectrum control.

This product can cause crop injury if applied when crops are stressed or if rates are too high. It has moderate soil residual activity that contributes to its pre-emergent effect.

15. Bentazon – Best Post-Emergent Herbicide For Purple Deadnettle In Soybeans

Bentazon is a selective post-emergent herbicide that inhibits photosynthesis in susceptible broadleaf weeds, including purple deadnettle. It is absorbed through leaves and translocated to growing points. It controls many broadleaf weeds without harming most grasses.

Bentazon is labeled for soybeans, corn, peanuts, and rice to control purple deadnettle and other broadleaf weeds. It works best when applied to small, actively growing weeds in fall or early spring. It is often tank-mixed with other herbicides for broader spectrum control.

This product has limited soil residual activity, so it does not prevent new weeds from germinating. It requires good spray coverage for effective control and is not effective on grasses or sedges.

16. Glyphosate – Best Non-Selective Herbicide For Purple Deadnettle

Glyphosate is a non-selective herbicide that kills purple deadnettle and most other vegetation it contacts. It is absorbed through foliage and translocated to roots, killing both top growth and the underground crown. It has no soil residual activity.

Glyphosate is used for fence line clearing, driveway cracks, and site preparation before planting. It works best when applied to actively growing purple deadnettle in fall or early spring, when the plant is moving energy to its roots. It is not selective, so it kills desirable plants on contact.

Resistance to glyphosate has developed in many weed species, so rotating to other modes of action helps preserve its effectiveness. It requires careful application to avoid drift onto desirable vegetation.

17. Glufosinate – Best Non-Selective Alternative For Purple Deadnettle

Glufosinate is a non-selective herbicide that controls purple deadnettle and other vegetation through contact action. It is absorbed through leaves and acts on contact, with symptoms appearing within hours. It is often used as an alternative to glyphosate where resistance is a concern.

Glufosinate is labeled for fence rows, rights-of-way, and non-crop areas. It has no soil residual activity, so it does not prevent new weeds from germinating. It works best when applied to small, actively growing vegetation with good spray coverage.

This product requires good spray coverage for effective control and works best on small weeds. It is less effective on large or stressed vegetation than systemic herbicides.

18. Diquat – Best Fast Burndown Herbicide For Purple Deadnettle

Diquat is a non-selective contact herbicide that rapidly desiccates purple deadnettle foliage. It is absorbed through leaves and disrupts cell membranes, causing wilting and browning within hours. It has no soil residual activity.

Diquat is labeled for fence rows, driveways, and non-crop areas. It controls small annual weeds and provides fast burndown where quick results are needed. It works best when applied to small, actively growing vegetation with good spray coverage.

This product requires good spray coverage for effective control and works best on small weeds. It is less effective on perennial species and large purple deadnettle plants because it does not move into roots.

19. Prodiamine + Sulfentrazone – Best Combination Herbicide For Purple Deadnettle

Prodiamine combined with sulfentrazone provides both pre-emergent and post-emergent control of purple deadnettle in turf. Prodiamine forms a soil barrier that prevents new deadnettle seeds from germinating, while sulfentrazone kills existing plants. The combination delivers the most complete control.

Prodiamine plus sulfentrazone is labeled for lawns, sports fields, and golf courses to control purple deadnettle and other winter annual weeds. It works best when applied in late summer or early fall before seed germination and again in spring as a post-emergent treatment.

This combination has significant soil residual activity from prodiamine that prevents new weeds from germinating for months. It requires even coverage for effective results and works best when applied according to label directions.

20. 2,4-D + Dicamba + MCPP – Best Three-Way Herbicide For Purple Deadnettle In Lawns

2,4-D combined with dicamba and MCPP provides broad-spectrum control of purple deadnettle and other broadleaf weeds in lawns and turf. All three ingredients are synthetic auxins that cause uncontrolled cell division and twisting. The combination delivers faster and more complete control than any single product.

This three-way combination is labeled for lawns, sports fields, and other turf areas. It controls purple deadnettle, henbit, clover, and other broadleaf weeds when applied to actively growing plants. It works best when applied in fall or early spring.

This combination has some soil residual activity that helps prevent new weeds from germinating. It requires even coverage for effective results and works best when applied according to label directions.

Tips For Controlling Purple Deadnettle With Herbicides

• Identify the weed first: Confirm that the weed is purple deadnettle and not henbit or another winter annual before choosing a product.
• Apply pre-emergent in late summer or early fall: Prodiamine, isoxaben, and three-way combinations prevent purple deadnettle seeds from germinating when applied before the fall flush.
• Treat post-emergent in fall or early spring: 2,4-D, dicamba, MCPP, and fluroxypyr work best on young, actively growing purple deadnettle before it sets seed.
• Improve turf density: Purple deadnettle thrives in thin, weak lawns. Fertilize, water, and mow at the correct height to help desirable grasses outcompete it.
• Rotate modes of action: Using the same herbicide group repeatedly selects for resistant weeds. Rotate between synthetic auxins, ALS inhibitors, and PPO inhibitors.
• Avoid drift: 2,4-D and dicamba can drift onto sensitive broadleaf plants and cause serious damage. Spray in calm conditions and use drift-reducing nozzles.
• Re-treat as needed: Purple deadnettle can regrow from seeds in the soil. Monitor treated areas and re-treat new flushes while they are small.

Herbicide For Purple Deadnettle Frequently Asked Questions

1. What is the best herbicide for purple deadnettle?

2,4-D amine is the best overall herbicide for purple deadnettle because it selectively kills broadleaf weeds without harming most grasses. Three-way products and pre-emergent combinations are best for season-long control.

2. Will 2,4-D kill purple deadnettle?

Yes, 2,4-D kills purple deadnettle when applied to actively growing plants. It is absorbed through leaves and translocated to roots, causing the plant to twist and die over one to three weeks.

3. What is the best pre-emergent for purple deadnettle?

Prodiamine, isoxaben, and three-way combinations are the best pre-emergent options for purple deadnettle. They form a soil barrier that prevents seeds from germinating when applied in late summer or early fall.

4. When should I spray purple deadnettle?

Spray purple deadnettle in fall or early spring when the plant is actively growing and before it sets seed. Pre-emergent products go down in late summer or early fall before germination.

5. Does purple deadnettle come back after spraying?

Purple deadnettle can regrow from seeds in the soil after post-emergent treatment. Pre-emergent herbicides and improved turf density help prevent regrowth.

6. Is purple deadnettle toxic to livestock?

Purple deadnettle is not considered toxic to livestock, but it is generally unpalatable. In pastures, it can reduce forage quality when it forms dense patches.

7. Can I use vinegar to kill purple deadnettle?

Vinegar can burn purple deadnettle foliage but rarely kills the roots. It works best as part of an integrated program combining hand-pulling, mulching, and selective herbicides.

Conclusion

2,4-D amine is the best overall herbicide for purple deadnettle because it selectively kills broadleaf weeds without harming most grasses. Dicamba, MCPP, three-way products, and fluroxypyr follow closely as broad-spectrum options for lawns, pastures, and crop fields.

For pre-emergent control, prodiamine, isoxaben, and combination products prevent purple deadnettle seeds from germinating when applied in late summer or early fall. Combining pre-emergent and post-emergent programs delivers the most reliable control across lawns and gardens.

Effective control requires correct product selection, proper timing, even spray coverage, and follow-up monitoring for regrowth. Rotating modes of action prevents resistance, and improving turf density and soil fertility reduces future infestations.

Start your purple deadnettle control program this season, choose the right product for your site, and plan for follow-up treatments each year. Consistent effort delivers a clean lawn and long-term control.