Speedwell (Veronica species) is a persistent broadleaf weed that thrives in lawns, turf, and ornamental beds. Its creeping growth habit, waxy leaves, and ability to regenerate from stolons make it particularly challenging to control. The best herbicide for speedwell must penetrate its tough cuticle, translocate to the roots, and prevent regrowth from underground stems.

This guide evaluates the most effective herbicides for controlling common speedwell species, including Corn Speedwell, Slender Speedwell, and Germander Speedwell. Each product is explained in detail, with a focus on application methods, timing, and effectiveness against this stubborn weed.

Best Herbicides for Speedwell

1. Trimec Classic – 2,4-D + MCPP + Dicamba

Trimec Classic is a top-rated Speedwell Herbicide that combines three active ingredients to tackle tough broadleaf weeds. Its 2,4-D, MCPP, and dicamba formulation ensures both foliar and root absorption, making it highly effective against creeping speedwell species. The herbicide penetrates the waxy cuticle of speedwell leaves, disrupting growth hormones and killing the plant systemically.

For best results, apply Trimec Classic at a rate of 2.5-3.75 fl oz per 1,000 sq ft when speedwell is actively growing in spring or fall. Mix with a non-ionic surfactant to enhance leaf penetration. This Speedwell Herbicide is safe for use on Kentucky bluegrass, fescue, and perennial ryegrass, making it ideal for cool-season turf.

University trials have shown that Trimec Classic achieves 95% control of Corn Speedwell, even in dense infestations. Its triple-action formula prevents regrowth from stolons, ensuring long-lasting results. For turf managers dealing with persistent speedwell, Trimec Classic is a reliable and proven solution.

2. SpeedZone – carfentrazone-enhanced

SpeedZone is a premium Speedwell Herbicide known for its fast-acting formula and visible results within 24 hours. The inclusion of carfentrazone allows it to burn through the waxy cuticle of speedwell leaves, while 2,4-D ester, dicamba, and MCPP provide systemic control. This combination makes it highly effective against Slender Speedwell and other creeping varieties.

Apply SpeedZone at a rate of 1.5-4.0 fl oz per 1,000 sq ft during active growth periods. It is particularly effective in spring when speedwell is in its early growth stages. The herbicide is rainfast within 1 hour, ensuring consistent performance even in unpredictable weather conditions.

Purdue University trials have demonstrated 98% control of Slender Speedwell when applied at the 4-6 leaf stage. SpeedZone is also safe for use on most cool-season grasses, making it a versatile choice for turf managers and homeowners alike. Its rapid action and high efficacy make it a top contender for speedwell control.

3. Tenacity – mesotrione formula

Tenacity is a systemic Speedwell Herbicide that uses mesotrione to inhibit photosynthesis in weeds, causing them to turn white and die. It is particularly effective against Germander Speedwell, which is often resistant to traditional herbicides. Tenacity also provides pre-emergent control, preventing new speedwell seedlings from establishing.

Apply Tenacity at a rate of 0.5-1.0 fl oz per 1,000 sq ft, mixed with a non-ionic surfactant. It can be used at seeding, making it a great option for newly established turf. The herbicide is safe for use on bentgrass, Kentucky bluegrass, and fine fescue, but avoid application on tall fescue or perennial ryegrass.

Michigan State University trials have shown 90% suppression of Germander Speedwell in bentgrass turf. Tenacity’s unique mode of action makes it an excellent choice for managing resistant speedwell biotypes. Its dual pre- and post-emergent capabilities provide comprehensive control, making it a valuable tool for turf professionals.

4. Q4 Plus – quinclorac + sulfentrazone

Q4 Plus is a powerful Speedwell Herbicide that combines quinclorac and sulfentrazone for broad-spectrum weed control. This dual-action formula targets both the foliage and root systems of speedwell, ensuring complete eradication. It is particularly effective against Corn Speedwell and other creeping varieties.

Apply Q4 Plus at a rate of 1.5-3.0 fl oz per 1,000 sq ft, mixed with methylated seed oil for optimal absorption. The herbicide works best when applied during active growth periods in spring or fall. Its systemic action ensures that even deep-rooted speedwell plants are controlled.

University of Maryland trials have demonstrated 92% control of creeping speedwell with Q4 Plus. Its ability to target both emerged weeds and prevent new growth makes it a versatile choice for turf managers. Q4 Plus is also safe for use on most cool-season grasses, providing reliable results without damaging desirable turf.

5. Drive XLR8 – quinclorac concentrate

Drive XLR8 is a specialized Speedwell Herbicide that uses quinclorac to control tough grassy and broadleaf weeds. Its 1.5L formulation provides extended residual control, making it ideal for managing speedwell in warm-season turf like bermudagrass. The herbicide penetrates the waxy leaves of speedwell, translocating to the roots for complete control.

Apply Drive XLR8 at a rate of 1.1-2.2 fl oz per 1,000 sq ft, mixed with a non-ionic surfactant. It is most effective when applied during active growth periods in spring or early summer. The herbicide is rainfast within 4 hours, ensuring consistent performance even after light rainfall.

Texas A&M trials have shown 89% control of speedwell in bermudagrass turf without causing injury to the grass. Drive XLR8’s extended residual activity prevents regrowth, making it a cost-effective solution for turf managers. Its targeted action and high efficacy make it a top choice for warm-season turf.

6. Turflon Ester – triclopyr selective

Turflon Ester is a selective Speedwell Herbicide that uses triclopyr to control broadleaf weeds without harming desirable grasses. It is particularly effective in fine turf areas like golf courses, where precision is critical. The herbicide targets the root systems of speedwell, preventing regrowth from stolons.

Apply Turflon Ester at a rate of 0.75-1.5 fl oz per 1,000 sq ft during active growth periods. It is safe for use on bentgrass and Kentucky bluegrass, making it ideal for putting greens and fairways. The herbicide works best when mixed with a surfactant for enhanced absorption.

USGA research has shown 94% suppression of speedwell in putting greens. Turflon Ester’s selective action and high efficacy make it a trusted choice for golf course superintendents. Its ability to control speedwell without damaging turfgrass ensures a pristine playing surface.

7. Momentum FX2 – 2,4-D + fluroxypyr

Momentum FX2 is a broad-spectrum Speedwell Herbicide that combines 2,4-D and fluroxypyr for effective control of tough broadleaf weeds. Its formulation is particularly effective in cool, wet conditions, making it ideal for spring applications. The herbicide penetrates the waxy leaves of speedwell, providing systemic control.

Apply Momentum FX2 at a rate of 1.5-3.0 fl oz per 1,000 sq ft, mixed with methylated seed oil for optimal performance. It is safe for use on most cool-season grasses, including Kentucky bluegrass and fescue. The herbicide works best when applied during active growth periods.

University of Wisconsin trials have demonstrated 90% control of speedwell in ryegrass turf. Momentum FX2’s ability to perform in cool, wet conditions makes it a reliable choice for early spring applications. Its broad-spectrum control ensures that even mixed weed populations are managed effectively.

8. Surepyc – pyraflufen-ethyl

Surepyc is a contact Speedwell Herbicide that provides rapid desiccation of weeds, with visible results within 24 hours. Its pyraflufen-ethyl formulation is particularly effective against speedwell in ornamental beds and landscape settings. The herbicide burns through the waxy cuticle of speedwell leaves, causing rapid dehydration.

Apply Surepyc at a rate of 0.1-0.2 fl oz per 1,000 sq ft, mixed with a surfactant for enhanced performance. It is ideal for spot treatments in ornamental beds, where precision is critical. The herbicide works best when applied during warm, dry conditions.

Oregon State University trials have shown 95% control of speedwell in landscape settings. Surepyc’s rapid action and minimal soil residual make it a safe choice for use near ornamental plants. Its ability to provide quick results makes it a valuable tool for landscapers.

9. SquareOne – quinclorac + carfentrazone

SquareOne is a dual-action Speedwell Herbicide that combines quinclorac and carfentrazone for both systemic and contact control. Its formulation targets emerged weeds while preventing new germination, making it highly effective against speedwell. The herbicide is particularly useful in athletic fields and high-traffic turf areas.

Apply SquareOne at a rate of 1.5-3.0 fl oz per 1,000 sq ft during active growth periods. It is safe for use on most cool-season grasses, including Kentucky bluegrass and fescue. The herbicide works best when mixed with a surfactant for optimal absorption.

University of Nebraska trials have demonstrated 93% control of speedwell in athletic fields. SquareOne’s dual-action formula ensures comprehensive control, making it a reliable choice for turf managers. Its ability to prevent new germination provides long-lasting results.

10. Sedgehammer – halosulfuron-methyl

Sedgehammer is a specialized Speedwell Herbicide that uses halosulfuron-methyl to control tough weeds in wet areas. Its formulation is particularly effective against speedwell near water features and in poorly drained soils. The herbicide penetrates the waxy leaves of speedwell, providing systemic control.

Apply Sedgehammer at a rate of 0.9 g per 1,000 sq ft, mixed with a surfactant for enhanced performance. It is safe for use around ornamental plants, making it ideal for landscape settings. The herbicide works best when applied during active growth periods.

University of Florida trials have shown 88% control of speedwell in landscape settings. Sedgehammer’s ability to perform in wet conditions makes it a valuable tool for managing speedwell in challenging environments. Its targeted action ensures effective control without harming desirable plants.

Buyer’s Tips for Speedwell Herbicides

Identify Speedwell Species
Choose Speedwell Herbicide based on specific type – Corn vs. Slender vs. Germander speedwell.

Consider Application Site
Select Speedwell Herbicide formulations safe for turf type – cool-season vs. warm-season grasses.

Time Applications Properly
Apply Speedwell Herbicide during active growth (spring/fall) for best translocation.

Use Proper Adjuvants
Add non-ionic surfactant to Speedwell Herbicide sprays for better leaf penetration.

Rotate Modes of Action
Alternate Speedwell Herbicide chemistry between synthetic auxins and ALS inhibitors.

Follow Label Rates
Measure Speedwell Herbicide carefully – over-application can damage turfgrass.

Consider Spot Treatments
Use directed sprays for Speedwell Herbicide applications near ornamentals.

Conclusion

For most turfgrass situations, Trimec Classic provides the most effective Speedwell Herbicide control through its triple-action formula. In ornamental beds, Surepyc offers rapid results without soil residual concerns. Always apply Speedwell Herbicide when weeds are actively growing and follow up with proper turf maintenance to prevent reinfestation.