2,4-D is a selective broadleaf herbicide that kills dandelion, clover, plantain, and most broadleaf weeds while leaving most lawn grasses alive. The active ingredient has been in use since the 1940s and remains the most cost-effective broadleaf control for residential lawns and pastures. After comparing 11 popular formulations across active ingredient blend, rainfast time, and label flexibility, these five covered the practical homeowner and small-acreage range.
Quick comparison
| Pick | Active ingredients | Best for |
|---|---|---|
| Hi-Yield 2,4-D Selective Weed Killer | 2,4-D amine 46.3% | Best overall |
| Southern Ag Amine 2,4-D | 2,4-D amine 46.3% | Best value |
| Speed Zone Lawn Weed Killer | 2,4-D + MCPP + dicamba + carfentrazone | Best for fast knockdown |
| Trimec Classic | 2,4-D + MCPP + dicamba | Best for tough weeds |
| Crossbow Specialty Herbicide | 2,4-D + triclopyr | Best for pasture and brush |
Hi-Yield 2,4-D Selective Weed Killer - Best Overall
The Hi-Yield 2,4-D Selective Weed Killer is a 46.3 percent dimethylamine salt of 2,4-D, the standard formulation that has dominated the residential market for decades. Coverage spans lawns, pasture, fence rows, and non-crop areas, with detailed label rates by grass type. The amine formulation is lower-volatility than ester products, making it safer for use near gardens and ornamentals.
Rate is 1 to 1.5 fluid ounces per gallon of water, covering roughly 500 square feet per gallon mixed. A pint of concentrate treats 8000 to 12000 square feet, which is a typical residential lawn. Rainfast in 6 to 8 hours; if rain is forecast within 8 hours, delay application.
Around $20 to $30 per pint, $40 to $55 per quart. The right pick for most homeowners doing broadleaf weed control on cool-season grass lawns. The single active ingredient is enough for the most common weeds (dandelion, clover, plantain) and the price per area treated is the best in the comparison.
Southern Ag Amine 2,4-D - Best Value
The Southern Ag Amine 2,4-D is a 46.3 percent dimethylamine 2,4-D, the same active concentration as Hi-Yield and most professional 2,4-D products. Southern Ag is a value brand widely sold in the Southeast and through online distributors. Application rate and weed spectrum match Hi-Yield; the difference is price and distribution.
Pack sizes run from pint to gallon. The gallon size brings the per-acre cost down meaningfully for buyers treating a larger property or pasture. Quality control is acceptable; the active ingredient concentration is consistent.
Around $15 to $22 per pint, $35 to $45 per quart, $90 to $115 per gallon. The right pick for buyers who want the standard 46.3 percent 2,4-D at the lowest credible price. Gallon size makes sense for properties over half an acre or buyers treating annually.
Speed Zone Lawn Weed Killer - Best for Fast Knockdown
Speed Zone combines 2,4-D, MCPP, dicamba, and carfentrazone-ethyl into a four-way blend that delivers visible weed damage within 24 hours. The carfentrazone-ethyl is the speed component; it accelerates leaf burn-down while the 2,4-D and dicamba work through the systemic kill. The four-way blend expands the weed spectrum to include tough weeds (oxalis, ground ivy, wild violet) that 2,4-D alone struggles to kill.
The trade-off is grass safety. The carfentrazone can cause temporary yellowing on cool-season grasses at high temperatures or high application rates. Apply at the lower label rate in late spring and early summer to minimize grass stress. Warm-season grass tolerance is grass-specific; check the label for St. Augustine and centipede.
Around $40 to $55 per pint, $80 to $110 per quart. The right pick for buyers who want fast visible results on a mixed weed lawn and tolerate the higher cost for the speed and spectrum.
Trimec Classic - Best for Tough Weeds
Trimec Classic is the original three-way blend of 2,4-D, MCPP, and dicamba, in use for over 40 years. The MCPP adds control of clover and chickweed that 2,4-D alone treats slowly. The dicamba expands control to ground ivy, wild violet, and oxalis. The blend covers nearly every broadleaf weed found in residential lawns without adding the carfentrazone-ethyl found in Speed Zone.
Application is similar to single-component 2,4-D at 1 to 1.5 fluid ounces per gallon. Rainfast in 6 to 8 hours. The amine formulation is suitable for use up to roughly 85F; above that the dicamba volatility rises and drift risk increases.
Around $35 to $50 per pint, $70 to $95 per quart. The right pick for buyers with mixed weed pressure who want the proven three-way blend without paying for the carfentrazone speed feature.
Crossbow Specialty Herbicide - Best for Pasture and Brush
Crossbow combines 2,4-D and triclopyr in a blend targeted at pasture, rangeland, and fence-row brush. The triclopyr is the brush-killing component; it controls woody plants (multiflora rose, blackberry, sumac) that 2,4-D alone cannot kill. Use Crossbow on pasture for thistles and broadleaf weeds, and along fence rows for brush control.
The trade-off is grass safety. Crossbow can damage some forage grasses at high rates; read the label for grass-specific tolerance. The product is not labeled for residential turf in some states. Verify legal use for the application before buying.
Around $60 to $80 per quart, $120 to $160 per gallon. The right pick for small-acreage landowners, pasture managers, and rural property owners controlling brush and broadleaf weeds together.
How to choose a 2,4-D herbicide
Match the active blend to the weed spectrum
For lawns with only dandelion, plantain, and clover, single-active 2,4-D is enough. For lawns with ground ivy, wild violet, or oxalis, a three-way or four-way blend is meaningfully more effective. For pasture or brush, a 2,4-D plus triclopyr blend handles the woody species 2,4-D alone cannot kill.
Read the label for grass safety
2,4-D and its blends list approved grass species at the labeled rates. Cool-season grasses (bluegrass, fescue, ryegrass) are well-tolerated. Warm-season grasses (Bermuda, zoysia, St. Augustine, centipede) range from well-tolerated to sensitive. Bentgrass and golf-quality turf are usually not labeled. Skipping the label read costs a lawn.
Apply at the right temperature and wind
Below 85F daytime high, below 10 mph wind, no rain forecast for 6 to 8 hours. Outside these conditions, drift risk rises (vapor drift to gardens, droplet drift to ornamentals) and effectiveness drops. Early morning or late afternoon application is usually correct; midday in summer is wrong.
Use a marker dye in the tank
Tank-mix dye (typically blue or green vegetable dye) shows what has been sprayed and what has not. The most common application mistake is missing patches; a dye eliminates this almost entirely. Add 1 to 2 ounces of dye per gallon and mix before adding the herbicide.
For more on lawn care, see our lawn aerating frequency guide and our battery-powered sprayer comparison. Our testing methodology explains how we compare herbicide products across weed spectrum and label fit.
A 2,4-D herbicide is the standard tool for residential broadleaf weed control. The Hi-Yield 46.3 percent amine is the default pick for most lawns. The other four picks cover value, fast knockdown, tough weed control, and pasture and brush use cases.
Frequently asked questions
What weeds does 2,4-D kill?+
2,4-D kills most broadleaf weeds including dandelion, plantain, chickweed, henbit, dollarweed, ground ivy, oxalis, white clover, wild onion, wild violet, and many others. It does not kill grass weeds like crabgrass, foxtail, or nutsedge. For complete weed control you typically need 2,4-D plus a grassy weed herbicide. Blended products combine 2,4-D with dicamba, MCPP, and triclopyr to expand the weed spectrum without changing the grass-safety property.
How long does 2,4-D take to work?+
Visual symptoms appear in 24 to 48 hours; treated weeds twist, curl, and turn yellow. Complete kill takes 7 to 14 days depending on weed size, weather, and species. Mature dandelion can take up to 21 days for full kill including the taproot. Do not retreat before 14 days; the herbicide is still working even when the weeds appear to have stopped declining. Rainfast time varies by product from 1 to 6 hours after application.
Is 2,4-D safe for lawns?+
Yes when applied at label rate on the listed grass species. Cool-season grasses (Kentucky bluegrass, perennial ryegrass, tall fescue, fine fescue) tolerate 2,4-D well. Warm-season grasses (Bermuda, zoysia, St. Augustine, centipede, bahia) vary; St. Augustine and centipede show damage at full rate and need reduced application or a different herbicide. Bentgrass lawns and golf greens are sensitive and should not be treated. Read the label for grass-specific rates.
Can I apply 2,4-D in hot weather?+
No, not above roughly 85F to 90F depending on the formulation. High temperatures increase volatility; 2,4-D vapor drifts onto sensitive plants (tomatoes, grapes, ornamentals) and causes damage hundreds of feet from the application area. Apply in spring or fall when daytime highs are 60F to 80F and there is no wind. Amine formulations are less volatile than ester formulations and tolerate slightly warmer conditions, but the temperature limit still applies.
How much does 2,4-D cost per acre?+
Concentrate-format 2,4-D at typical lawn rates (1 to 2 pints per acre) costs 8 to 25 dollars per acre depending on the brand and blend. Ready-to-use spray bottles cost 5 to 10 times more per area treated and are only economical for spot treatment of individual weeds. For a 5000 to 10000 square foot lawn, buying a quart of concentrate covers 2 to 4 full lawn applications at meaningfully lower cost than premixed product.
