Amine 400 vs Trimec: Which is the best post emergent herbicide?

Post-emergent herbicides are useful during the spring season when weeds start growing on your lawn. The purpose of the herbicide is to get into the root system through the plant’s stalk and kill it.

Two of the most commonly used post-emergent herbicides are Amine 400 and Trimec. Choosing what to use between the two can be confusing, especially if you don’t know the difference.

Amine 400 and Trimec are herbicides formulated to control unwanted broadleaf weeds. The two chemicals can eliminate many broadleaf weeds, including dandelions, clovers, chickweed, and more.

Furthermore, while many people apply them on lawns, they can also control weeds in corn, barley, wheat, rangelands, and pastures.

The two herbicides contain almost the same chemical formulations. However, Trimec is a 3-way herbicide blend while Amine 400 is a one-way herbicide blend.

But which one is the best to use?

Amine 400 vs. Trimec: Which is the best post-emergent herbicide?

Amine 400 and Trimec are not different. They achieve the same results when applied on a lawn. And although they may have slight differences, none of the chemicals is superior to the other.

Here are some factors why both herbicides are effective for the post-emergent treatment of weeds.

1. Amine 400 vs. Trimec: Active ingredients

Amine 400

Amine 400 is a one-way post-emergent herbicide that contains one active ingredient called Dimethylamine salt of 2,4-dichlorophenoxyacetic acid (2,4-D DMA) at 46.47% of the entire chemical formulation.

The herbicide will kill most broadleaf weeds by curtailing their growth. Once a plant absorbs the chemical, it causes uncontrolled and unsustainable growth. As a result, its stem curls over, its leaves wither, and eventually, it dies.

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On the other hand, Trimec has three active ingredients; Dimethylamine salt of 2,4-dichlorophenoxyacetic acid at 30.56%, Dimethylamine salt of 2-(2-methyl-4-chlorophenoxy) propionic acid at 16.34%, and Dimethylamine salt of dicamba: 3,6-dichloro-o-anisic acid at 2.77%.

Although the three chemicals cause uncontrolled and unsustainable plant growth, they also increase plant growth rate, leading to biological aging or gradual deterioration of the plant and eventual cell death.

Therefore, when comparing active ingredients in the two chemicals, Trimec is more potent than Amine 400.

2. Amine 400 vs. Trimec: Rainfast period

The rainfast period refers to the length when it does not rain after applying the herbicide. In other words, if it rains or you irrigate the area during the rainfast period or after applying the chemicals, the effectiveness of the herbicide will reduce.

Amine 400 and Trimec have a rainfast period of between six and eight hours. Therefore, if it rains within eight hours after applying either chemical, the plants or weeds may not die.

3. Amine 400 vs. Trimec: Mowing after application

When you apply a post-emergent herbicide, you must wait some time for the plants to absorb the chemicals and destroy their cell structure. Once done, you can come with your lawn mower and remove the dead plants.

You can mow your lawn after three days of applying Amine 400 or Trimec. However, if you prefer mowing your lawn before applying, consider doing it three days before applying the chemicals.

4. Amine 400 vs. Trimec: Replanting after application

After applying any post-emergent herbicide, it is bad practice to plant immediately. The chemicals are still toxic and can destroy good seeds. Therefore, you must wait for the chemical to dry before applying it.

Once you apply Amine 400 or Trimec, consider reseeding after four weeks. If you have a new lawn, apply the chemical after the grass has reached two inches in height and mowed at least two times.

5. Amine 400 vs. Trimec: Coverage

A one-gallon mixture of Amine 400 can cover an area of up to 174,240 square feet of a targeted space.

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On the other hand, a one-gallon mix of Trimec can cover an area of 32,000 to 64,000 square feet of a targeted area.

6. Amine 400 vs. Trimec: Areas of application

Amine 400 has broader applications than Trimec. You can use Amine 400 in pastures, rangeland, woody plants, brush, broadleaf weeds, ornamental turf, grain sorghum, and soybeans.

On the other hand, Trimec does not have a broader application. Instead, you can only apply it on lawns. That includes golf courses, hospitals, nursing homes, museums, and schools.

7. Amine 400 vs. Trimec: Re-application

You may want to re-apply Amine 400 or Trimec after the first application. In that case, you can only re-apply Trimec after waiting a minimum of 30 days. Also, ensure the maximum number of broadcast applications is not more than two a year.

On the other hand, consider waiting for a minimum of 30 days between applications of Amine 400 for rangeland and pasture.

However, the maximum number of applications per year will depend on the manufacturer’s instructions.

What is Amine 400 used for?

Amine 400 is a post-emergent herbicide formulated to control broadleaf weeds. Homeowners use it to eliminate broadleaf weeds, such as fleabane, pigweed, smartweed, and parsnip.

You can also apply it in pastures, lawns, corn, sorghum, barley, and wheat fields.

How long does Amine 400 last?

Amine 400 contains 2,4-D as its main ingredient. This means that the half-life of 2,4-D ranges from 13 to 40 days. However, that will depend on weather conditions.

Also, if you apply Amine 400, you should wait a minimum of 30 days before re-applying the chemical, particularly on rangelands and pastures.

When should I apply Amine 400 to my lawn?

You can apply Amine 400 in the spring, summer, or fall when weeds are actively growing. Also, allow at least two days after mowing before applying the chemical.

When ready to use, ensure the temperatures do not exceed 90 degrees F and that humidity levels are high.

Can I spray Amine 400 on wet grass?

Applying Amine 400 on wet grass is counterproductive. If it has rained or you have irrigated your area, allow time for the area to dry before application.

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You can apply Amine 400 on moist ground. But you should ensure that the weeds do not have water droplets on them when applying the herbicide.

Is Trimec the same as 2,4-D?

Trimec contains the chemical compound 2,4-Dichlorophenoxyacetic acid. Therefore, if you want a herbicide with 2,4-D, consider buying Trimec.

Trimec Weed Killer

What is Trimec good for?

Trimec is a broadleaf herbicide used to control unwanted weeds in turfs, such as clover, chickweed, dandelion, and plantain.

It can also eliminate hard-to-kill weeds without the necessity to repeat the application. But people use it to kill unwanted plants on lawns only.

When should I apply Trimec to my lawn?

You can apply to Trimec in the spring or early summer. The best time to apply is when air temperatures exceed 85 degrees F.

If the temperatures are above 85 degrees F when applying the chemical, it may not work well.

Can I spray Trimec on wet grass?

Avoid applying Trimec on wet grass. The chemical works well at least 24 hours before the rain or lawn irrigation.

That way, Trimec will have enough time to dry and get soaked by the plant system.


Amine 400 and Trimec are two of the best broadleaf herbicides for killing unwanted plants. The two chemicals contain the same active ingredient, Dimethylamine salt of 2,4-dichlorophenoxyacetic acid.

However, Trimec is a 3-way herbicide, while Amine 400 is a one-way herbicide.

In other words, while Amine 400 only has 2,4-dichlorophenoxyacetic as its active ingredient, Trimec has three active ingredients, including 2,4-dichlorophenoxyacetic, Dimethylamine salt of 2-(2-methyl-4-chlorophenoxy) propionic acid, and Dimethylamine salt of dicamba: 3,6-dichloro-o-anisic acid.

Understand that you can only use Trimec on lawns. But Amine 400 has a wide application, including lawns, pastures, corn, sorghum, barley, and wheat fields.

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