3 Corner Jack (Bidens alba) is a persistent broadleaf weed that invades warm-season lawns and garden beds. It spreads quickly and competes aggressively with turf for nutrients and sunlight. To effectively control this weed, using the right herbicide is essential.

Products containing systemic broadleaf-selective chemicals are most effective at targeting 3 Corner Jack without damaging turf.

Timing—when weeds are actively growing—also improves outcomes. This guide highlights 10 dependable weed killers designed to eliminate this common lawn invader.

We evaluated each product for efficacy, safety on grass, rainfast timing, and cost. These options cater to both spot treatment and full-lawn needs. Read on to find the best weed killer for tackling 3 Corner Jack in your lawn.

Top 10 Best Weed Killers For 3 Corner Jack

1. Ortho WeedClear Lawn Weed Killer

Ortho WeedClear is a selective broadleaf herbicide combining 2,4-D, dicamba, and quinclorac. Ortho WeedClear Lawn Weed Killer effectively controls 3 Corner Jack without harming warm-season turf. Its built-in hose-end sprayer ensures easy and even application.

It becomes rainproof in just an hour, with visible yellowing in days. Ideal for spring and early summer when weeds are active. Suitable for medium to large lawns.

Apply during calm conditions and keep pets off until dry. Store in a cool, sealed container. Reapply only if new patches appear.

2. Spectracide Weed Stop for Lawns

Spectracide Weed Stop uses a blend of 2,4-D, dicamba, and MCPP for broadleaf weed control. Spectracide Weed Stop for Lawns works well on 3 Corner Jack and other unwanted weeds. Choose between concentrate or ready-to-spray options.

Turn yellow in 5–7 days; rainproof in 6 hours. It’s affordable and effective for maintenance applications. Best used in active growing season.

Wear gloves and eye protection during application. Avoid mowing 24 hours before and after treatment. Store in a dry place out of direct sun.

3. Ortho Weed B Gon for Lawns

Ortho Weed B Gon combines 2,4-D, MCPP, and dicamba for fast broadleaf weed control. Ortho Weed B Gon for Lawns is proven effective on tough weeds like 3 Corner Jack. Available in ready-to-use and concentrate formats.

Works quickly with visible results in 2–3 days. Rainproof in 1 hour. Ideal for homeowners needing quick control.

Do not apply on newly seeded lawn. Use personal protective equipment. Reseed after two weeks if needed.

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

Hi-Yield’s formula offers strong yet affordable weed control targeting broadleaf species. Hi-Yield 2,4-D Selective Weed Killer works well in warm-season turf fighting 3 Corner Jack. Available in concentrate, covering large areas.

Visible decline in 5–10 days; rainfast in 6 hours. Best applied on calm, sunny days. Suitable for residential and commercial lawns.

Keep pets and children off treated areas until dry. Follow mix instructions precisely. Store sealed in a safe location.

5. Gordon’s Trimec Lawn Weed Killer

Gordon’s Trimec combines 2,4-D, dicamba, and MCPP for broad-spectrum weed removal. Gordon’s Trimec Lawn Weed Killer effectively targets 3 Corner Jack and related weeds. Compatible with both cool- and warm-season turf.

Shows results in about 5 days. Use hose-end or pump sprayer for coverage. Rainproof quickly after application.

Store original container upright. Keep out of reach of children. Wear PPE during application.

6. Fertilome Weed-Out Lawn Weed Killer

Fertilome Weed-Out contains a blend of effective broadleaf herbicides including 2,4-D. Fertilome Weed-Out Lawn Weed Killer targets 3 Corner Jack and over 200 other weeds. A quart covers thousands of square feet.

Starts working in hours with visible yellowing in 3–7 days. Rainproof quickly after drying. Best used when weeds are actively growing under warm conditions.

Avoid watering lawn for 24 hours post-application. Store upright and sealed. Avoid use near desirable ornamental plants.

7. SpeedZone Lawn Weed Killer

SpeedZone blends 2,4-D with carfentrazone for quick weed elimination. SpeedZone Lawn Weed Killer can show results in 24 hours on 3 Corner Jack. Ideal when quick correction is needed.

Works well in cooler temperatures. Controls broadleaf weeds effectively in athletic fields and home lawns. Rainfast within 2 hours.

Apply with precise equipment to minimize waste. Keep off-treated areas until dry. Tested safe on established turf types.

8. Bonide Weed Beater Ultra

Bonide Weed Beater Ultra includes 2,4-D, glyphosate, and dicamba for a powerful weed solution. Bonide Weed Beater Ultra works in cold weather and provides long-lasting control. Suitable for use in early spring or late fall.

Controls tough weeds like 3 Corner Jack. Visible results in a few days. Best applied on calm, non-rainy days.

Use PPE when spraying. Reseed treated areas after recommended time. Store away from high heat and direct sunlight.

9. Compare-N-Save 2,4-D Amine Weed Killer

Compare-N-Save 2,4-D Amine is a cost-effective herbicide for large lawn or pasture areas. Compare-N-Save 2,4-D Amine Weed Killer is effective against widespread 3 Corner Jack. Ideal for properties needing large coverage.

Coverage up to thousands of square feet per gallon. Rainproof, with results in 5–10 days. Apply when weather is calm and warm.

Follow proper dilution rates. Keep children and animals away until dry. Store in original container securely.

10. RM43 Total Vegetation Control

RM43 is a non-selective herbicide combining glyphosate and imazapyr for total vegetation removal. RM43 Total Vegetation Control is suitable for hardscape and non-lawn areas affected by 3 Corner Jack. Provides long-term suppression.

Visible dieback in a few days; effective for up to a year. Requires dry weather post-treatment. Best for driveways, fence lines, and uncultivated zones.

Wear full PPE when applying. Avoid areas with desirable plants. Dispose of excess properly per label instructions.

Buyer’s Tips for Controlling 3 Corner Jack

1. Apply at the right growth stage: Treat weeds while actively growing for maximum uptake.
2. Use selective turf-safe products: Protect your lawn when targeting broadleaf weeds.
3. Follow rainfast timing: Wait specified hours before watering or rain to ensure effectiveness.
4. Wear PPE: Gloves, goggles, and long sleeves protect you during application.
5. Spot treat where possible: Minimize chemical use and environmental impact.
6. Keep pets cool: Let treated areas dry before allowing children or pets back.
7. Reseed bare areas: Fill in gaps after treatment to improve turf density.

Best Weed Killer For 3 Corner Jack (FAQs)

1. Will 2,4-D kill 3 Corner Jack? Yes, when used as directed and on actively growing weeds.
2. Can I use it on St. Augustine or Bermuda grass? Yes, if the product is labeled safe for your turf type.
3. How long until I see results? Most weeds show decline within 3–7 days.
4. Is repeat treatment needed? Sometimes—especially with heavy infestations or re-sprouting weeds.
5. What if it rains early? Reapply if rain occurs before the product has dried and become rainproof.
6. Can I mix it with fertilizer? Only if label indicates compatibility—otherwise avoid tank mixing.
7. Is it safe around edible plants? Use caution—avoid drift onto food crops and edible ornamentals.

Conclusion

Successfully eradicating 3 Corner Jack in your lawn depends on using the right herbicides at the right time.

The ten options above provide effective, turf-safe control for various lawn types and conditions. Always follow label instructions and safety guidelines to protect your lawn and family.

Pair chemical control with good lawn maintenance to prevent re-infestation. Equip yourself with one of these top-rated weed killers for a weed-free lawn all season long.