2,4-D Amine Weed Killer

The classic, inexpensive selective broadleaf herbicide. The amine-salt formulation (vs. ester) is lower-volatility, so it's the safer choice when temperatures are warm and drift onto sensitive plants is a concern. Note this one carries the stronger DANGER signal word (primarily an eye-hazard flag for the concentrate).

Maker: Southern Ag
Active: Dimethylamine salt of 2,4-D, 46.8% — 3.8 lb acid equiv/gal
MoA group: WSSA Group 4 (synthetic auxin / growth regulator)
Net contents: 1 quart (.946 L)
Coverage: TBD
Signal: danger

2,4-D Amine Weed Killer label — The shed bottle — 2,4-D Amine Weed Killer, read straight off the label.

✍ On the jug — Dan's note"2/4D Amine broadleaf weed control — 1.33 fluid ounces per gallon" Read off the jug, not the label rate — verify against the booklet before mixing.

01Usage

What it's for and where it goes.

Targets: Broadleaf weeds — dandelion, plantain, clover, thistle, and many others. Does not kill grasses (selective), so it's used to clean up lawns, pastures, and turf.
Where: Pastures, rangeland, lawns, golf courses, cemeteries, parks, fences, ditchbanks, roadsides, industrial sites.
Rate: Your note reads ~1.33 fl oz/gal. Label rate varies by site and weed.
Pairs with: MSO or a surfactant improves uptake on tougher/waxy weeds.

02Efficacy

How well it actually works.

Very effective and cheap on common lawn/pasture broadleaves.
Amine salt = lower vapor drift than ester forms, but can still drift as spray droplets.
Slower, growth-regulator kill (plants twist and distort over days), not a fast burn-down.

03Best at killing

What it's genuinely strongest on in real use.

Common lawn and pasture broadleaves — 2,4-D is at its best on dandelion, plantain, clover, chickweed, and thistle, where university extension work and decades of practitioner use rate it cheap and dependable (PNW Handbooks, NPIC 2,4-D).
Its ceiling is exactly there: it is a selective growth-regulator, so it will not touch grasses, and it is weaker on waxy or woody weeds than the ester or four-way products. Adding MSO lifts it on the tougher ones.

04Dangers

What it can hurt — read this before you reach for it.

Signal word DANGER — the concentrate is a notable eye irritant/corrosive risk. Wear eye protection when handling.
Off-target damage: Death to broadleaf ornamentals, vegetables, tomatoes, grapes, and trees if it contacts them or drifts. Keep well away from gardens and beds.
Do not spray on windy days; keep away from water.
Keep out of reach of children.

05🐾 Dogs & re-entry

Pet safety — toxicity and how long until a dog can be back on it.

🐾 Pet safety — read before you let the dog out

Toxicity: moderate, and dogs are a standout — "Dogs may be more sensitive to 2,4-D than other animals" (NPIC 2,4-D General Fact Sheet). Ingestion signs in dogs/cats include "vomiting, diarrhea, loss of appetite, lethargy, drooling, staggering, or convulsions."
Main exposure route: a dog walking wet grass then grooming its paws/fur, or eating treated grass (NPIC).
When safe again: NPIC says to "stay away from grass or plants that have been treated until the leaves are dry." Keep dogs off until fully dry; a 2019 dog-urine study (Knapp et al., Sci Total Environ) found phenoxy residues linger longer on dry/brown turf, so 24–48h and after a rain or irrigation is the cautious default.

General guidance. Confirm the label's re-entry interval and ask your vet; when unsure keep dogs off until fully dry.

06Storage

How to keep it, and keep it separate.

Store in original container, tightly closed, cool/dry, away from children, food, and feed.
Keep separate enough that the DANGER concentrate isn't grabbed by mistake.
Stable for years sealed.

landscape.gf.cx · chemicals · 24d-amine · filed 2026-07-23 · read off the label — verify every rate against the booklet