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Does Trimec Kill Crabgrass?

Does Trimec Kill Crabgrass?

Are you looking to restore your lawn back to its original luscious green glory? If so, then utilizing a product like Trimec could be the perfect solution. Trimec is an herbicide that has been known for controlling and eliminating common weeds in yards such as crabgrass, dandelions, chickweed, and clover. However, if you’re considering using this product on your lawn it’s important to familiarize yourself with how it works in order to determine whether or not it will effectively kill crabgrass. In this blog post we’ll explore what Trimec is and discuss whether or not it can actually “get rid of” unwanted crabgrass from your yard!

What Is Crabgrass?

Crabgrass is an aggressive type of annual grassy weed that can be a nuisance for gardeners and lawn owners. It grows quickly, producing dense mats of foliage, which crowds out desirable grasses and other plants. Crabgrass can also damage mowers due to its tough blades. Trimec is a widely used herbicide that contains three active ingredients: 2,4-D, dicamba and mecoprop-P. These chemicals are effective at controlling a variety of broadleaf weeds as well as crabgrass. However, before using any type of herbicide it’s important to be sure you’re targeting the correct plant.

What Is Crabgrass?

Why Is It So Hard To Kill?

Crabgrass is a tough weed that can be hard to control. It has extensive roots and grows rapidly, making it difficult to battle with traditional methods like tilling or hand pulling. Additionally, crabgrass can produce thousands of seeds each season, which are then dispersed by wind and wildlife and can remain dormant in the soil for years before germinating. This makes controlling crabgrass with chemical herbicides an even greater challenge. [1]

Does Trimec Kill Crabgrass?

The answer is yes. Trimec is a broad-spectrum herbicide used to control crabgrass, as well as many other weeds. It contains three active ingredients which work together to quickly kill crabgrass and its related species. When applied properly and at the right time of year, it can effectively manage crabgrass infestations in lawns. It works best when applied early in the growing season, before the weed has had a chance to mature and spread its seeds.

Trimec also provides long-term control by preventing reestablishment of new plants from seed germination. Properly used, this product will make your lawn more attractive while controlling pesky crabgrass growth. Keep in mind that preemergence applications should only be applied on healthy turfgrass.

Over-application can damage delicate roots and grass blades, so be sure to follow the application instructions carefully.

When used in combination with other methods of control, such as regular mowing and proper fertilization, Trimec can provide effective crabgrass control. With a little patience and diligence, you should notice an improvement in your lawn’s appearance over time. If you have any questions about using Trimec for controlling crabgrass, consult your local garden center or county extension office for more information. [2]

What Varieties Of Trimec Won’t Kill Crabgrass?

Trimec is a popular herbicide used to control weeds in lawns, but it won’t kill all types of crabgrass. The original Trimec formulation contains three active ingredients – 2,4-Dichlorophenoxyacetic acid (2,4-D), dicamba and mecoprop-p or MCPP. This combination of ingredients is known as a “weed and feed” product because it both kills weeds and provides nutrients for the grass. However, while this formulation will kill some varieties of crabgrass like smooth crabgrass (Digitaria ischaemum) and large crabgrass (Digitaria sanguinalis), it will not kill another common variety called hairy crabgrass (Digitaria ciliaris). This variety is more resistant to herbicides, so it requires a different type of treatment.

Fortunately, there are now varieties of Trimec that have been specially formulated to control hairy crabgrass. These formulations contain the same active ingredients as the original Trimec formula plus an additional ingredient called quinclorac. This extra ingredient helps kill off seedling and mature hairy crabgrass plants while leaving other turfgrasses unharmed. Therefore, if you have a lawn that is constantly plagued by this particular type of weed, using one of these specialized Trimec products could be your best bet for getting rid of it once and for all. [3]

How Do You Mix Trimec Crabgrass Killer?

Mixing Trimec crabgrass killer is a straightforward and easy process. Start by adding 1/2 to 2 ounces of the product per gallon of water in your sprayer or tank. If you are using a hose-end sprayer, follow the instructions on the package for mixing and applying the correct amount of Trimec. Once mixed, apply it evenly over the entire area you would like treated.

Always make sure to read the label carefully before spraying to ensure that proper precautions are taken. Allow the solution to dry before allowing pets or children back into treated areas. Reapply as necessary according to directions on product labeling for complete control of weeds such as crabgrass.

How Do You Mix Trimec Crabgrass Killer?

How Do You Use a Trimec Crabgrass Killer?

Trimec Crabgrass Killer is a powerful and effective herbicide that can help keep lawns looking neat, trim, and weed-free. It’s important to remember that Trimec should be used with caution – this product will kill not only crabgrass but also other grasses and weeds in addition to the crabgrass you’re targeting. To use it properly, follow these steps:

  1. Carefully read the label of your Trimec product to make sure you understand what kind of weeds it will target.
  2. Apply the product according to the instructions on the label; if you are using a spray bottle, aim at actively growing plants (not dormant ones) and apply generously until they are thoroughly wet.
  3. Avoid contact with desirable plants or grasses while spraying, as they could be killed by the product if it comes in contact with them.
  4. Wait at least four weeks before mowing your lawn after applying Trimec Crabgrass Killer; this will give the herbicide time to work and allow you to safely mow without spreading the product around and potentially killing unintended plants.

By following these steps, you can ensure that your weed problem is taken care of quickly and effectively without causing damage to other areas of your yard! [4]

How Long Does It Take For Trimec Crabgrass Killer To Work?

Trimec Crabgrass Killer is a fast-acting herbicide that can help to control and kill existing crabgrass in your lawn. It starts working within minutes of application, killing young crabgrass plants in as little as 24 hours. 

After 2–3 weeks, you should see significant results in terms of reduced crabgrass coverage in the area.

To ensure optimal effectiveness, it is important to follow the product label instructions regarding when to apply Trimec and how often to reapply if necessary. With regular applications and proper mowing practices, you should be able to keep your free throughout the growing season.

Dangers of Trimec

Trimec is a herbicide used to kill crabgrass, but it can also pose risks to humans and other animals. When applied incorrectly or in large amounts, Trimec can result in adverse side effects. It is important to read and follow the instructions on the label carefully before using Trimec.

Additionally, people should wear protective clothing and avoid contact with skin, eyes, or mouth when handling this product. Pets and children should not be allowed near areas where Trimec has been applied until the area is completely dry. Inhaling mist from spraying or dust particles could cause irritation of the nose, throat, eyes and lungs.

If any of these symptoms occur after exposure to Trimec, seek medical attention immediately. If a significant amount of Trimec is ingested, call a poison control center or doctor right away. Prolonged exposure to high concentrations of the pesticide could lead to more serious health effects. To reduce potential risks to people and the environment, it is important to read and follow all instructions on the label before using Trimec. Furthermore, it should only be used in accordance with local laws and regulations.

Trimec can also harm aquatic life if applied directly into water. Its use near ponds, lakes or other bodies of water should be avoided unless absolutely necessary as instructed by law or a professional applicator. Carefully review the product’s directions for proper use in order to protect yourself and the environment from any adverse effects.

By taking the proper precautions and following directions, Trimec can be a safe and effective solution for eliminating crabgrass in lawns or gardens.

The bottom line is that Trimec can be an effective way to rid your lawn of pesky weed problems, but it should not be taken lightly. It is important to read the product label carefully and take all necessary safety precautions when using this product. Additionally, local regulations regarding pesticide use should also be reviewed before applying Trimec. With the right knowledge and care, you can keep your lawn looking great without risking harm to yourself or the environment. [5]

Dangers of Trimec


What is the best herbicide to kill crabgrass in the lawn?

The best herbicide to kill crabgrass in a lawn is Trimec. This product contains three active ingredients (2, 4-D, mecoprop and dicamba) that work together to provide broad-spectrum control of annual and perennial grassy weeds. Trimec also kills other unwanted weeds such as dandelion, clover and plantain. It is easy to apply and can be used on both cool-season and warm-season grasses. For optimal results, it should be applied before the Crabgrass germinates for pre-emergence weed control or after emergence for post-emergence control. When using Trimec, always follow label directions carefully for best results.

What weeds does Trimec kill?

Trimec is a post-emergent selective herbicide that kills crabgrass, dandelion, chickweed, spurge and foxtail. It works well on many other common broadleaf weeds like ground ivy (also known as creeping charlie), plantain, clovers and lespedeza. The active ingredient in Trimec is 2,4-Dichlorophenoxyacetic acid, which stops the growth of broadleaf weeds by preventing photosynthesis from occurring. It’s important to note that it only affects actively growing plants and will not kill dormant or dead plants. When used properly, Trimec can be an effective tool for controlling stubborn weeds in your lawn or garden.

How long does it take for a Trimec crabgrass killer to work?

The effects of Trimec can be seen in as little as 3-4 days, depending on the weed species and environmental conditions. The best results usually occur when the herbicide is applied to actively growing weeds just after they have sprouted from seeds or regrown from underground rhizomes. In some cases, you may need to apply a second treatment for full control of a particular weed species. If used properly, Trimec can provide effective long-term control of many common broadleaf weeds.

What are the safety precautions I should take with Trimec?

It’s important to always read and follow label instructions before using any herbicide product. When handling Trimec, wear protective clothing such as long sleeves, pants, gloves and eye protection. Avoid inhaling or skin contact with the product, and be sure to use it only in areas where it will not come into contact with children or pets. Additionally, do not apply Trimec near crops or edible plants as it can cause damage or contamination of food sources.

What are the dangers of Trimec?

When used directly, Trimec is safe for use around people and pets. However, when not used properly it can cause serious harm to the environment. The active ingredient in Trimec, 2,4-Dichlorophenoxyacetic acid (2,4-D), is toxic to fish and other aquatic animals. It is also highly volatile, meaning it can evaporate quickly and travel long distances in the air before returning to earth as rain or snow. This makes it difficult to control where the chemical ends up once released into the environment. Additionally, if high concentrations of 2,4-D are applied to lawns or gardens with insufficient soil erosion control measures in place, runoff from heavy rains can carry the chemical into nearby streams, rivers, and lakes. This runoff can create long-term environmental damage. To ensure Trimec is used safely, apply it in accordance with product directions and always follow local laws and regulations regarding its use.

What are the dangers of Trimec?

Is Trimec the same as Roundup?

No, Trimec and Roundup are different products. While both can be used to kill weeds, Trimec is specifically designed to control a variety of broadleaf weeds in turfgrass and ornamentals, while Roundup is a non-selective herbicide that kills any plant it comes into contact with. Trimec contains the active ingredients 2,4-D, dicamba, and mecoprop-p (MCPP). It works by interfering with the growth of susceptible plants at the cellular level. On the other hand, Roundup contains glyphosate as its active ingredient which acts by blocking essential enzymes in plants. Trimec has been proven to effectively control crabgrass when applied at the recommended dosage rate. The key to successful crabgrass control is timing. Trimec should always be applied when the weed plants are young, small and actively growing. This will ensure maximum absorption of the active ingredients and better results.

Useful Video: How To Use Gordon’s


Trimec is an effective herbicide for killing crabgrass in the yard, provided that it is applied according to label instructions. If you have a large area with heavy infestation, multiple applications may be necessary to achieve effective control. The best way to keep crabgrass from coming back is through ongoing prevention and maintenance practices such as proper mowing, fertilization, and weed monitoring. With consistent application of Trimec every few months and regular upkeep of your lawn care plan, you can rest assured that your grass will remain healthy and free of crabgrass.

By following these steps, you should be able to enjoy a beautiful green lawn all season long!  Good luck with achieving the perfect lawn!


  1. https://www.lawnandpetal.com/does-trimec-kill-crabgrass/
  2. https://extension.psu.edu/postemergence-control-of-crabgrass-and-other-summer-annual-grasses-in-lawns
  3. https://peppershomeandgarden.com/trimec-crabgrass/
  4. https://www.domyown.com/will-trimec-classic-kill-crabgrass-qa-53987.html
  5. https://www1.zoysiafarms.com/prodspec.jsp?id=49AB