Best Weed Killer For Horse Pasture

Having a horse pasture can be challenging at times. With the constant growth of weeds and pesticides, you’ll need something that can keep them at bay. Fortunately, we’ll be going over 10 of the best weed killers for horse pasture. 

We’ve chosen each of these products based on their effectiveness, quality of chemicals, and their application rate. By the end, you’ll find a weed killer that will keep annoying weeds out and give your horses a safe place to graze grass. 

List of the Best Weed Killer For Horse Pasture

Southern Ag Amine 2,4-D WEED KILLER

The Southern AG Amine 2,4-D WEED KILLER ranks #1 on our list. It features dimethylamine salt (46%) and other ingredients (53.7%) to kill weeds quickly and effectively. Get this if you’re trying to protect your lawn from weeds that are harming your plants.

Also, this weed killer is versatile, as it can be used in almost any terrain. You can use the Southern AG for ditch banks, fences, pastures, and turf. Because of this, you’ll have no problem keeping your grass clean. 

To use this device, start by placing 2-3 tablespoons of the solvent in 3-5 gallons of water. This will be enough to cover over 1,000 squ. Feet. When applying it, use it as a low-pressure spray. If you have a fan nozzle, that will help improve its applications. 

However, you’ll want to avoid using Southern AG on plants. This product tends to drift while in use, which could accidentally kill your plants if you’re not careful. Spray it accurately to ensure that you’re affecting the right areas. 

Getting the Southern AG is a good choice if you are having trouble getting your grass in good condition. It will keep the weeds out, giving your grass the chance to grow properly. So, get this if you want to protect the growth rate of your garden. 


  • Kills actively growing weeds
  • Slows Bermuda weeds
  • 1,000 squ. ft of coverage


  • Not effective on dandelions
  • Takes 2 weeks to see results

Doctor Kirchner Natural Weed & Grass Killer

The Doctor Kirchner Natural Weed & Grass Killer ranks #2 on our list. It comes in multiple sizes (1, 1 ½, 5 gallons) to aid in removing weeds from your lawn. After unboxing, you can pour it onto your lawn with a backpack sprayer or pump sprayer. 

One of its main features is that it’s invasive. You can spray this grass killer in your garden and not have to worry about your plants and flowers getting infected. However, if you directly spray it against your plants, it might turn brown quickly. 

Its ingredients contain sodium chloride (4.0%) and other ingredients (94%) such as water, salt, and vinegar. Through these natural ingredients, you’ll remove weeds from your garden without causing too much damage to your plants. 

When using this product, you’ll want to spray it on unwanted weeds until it becomes wet. Always wear safety goggles and gloves, as the chemicals can cause a reaction if they penetrate your skin. 

Overall, you’ll like Doctor Kirchner if you want a tool that’s effective in removing pesky weeds from your garden. After spraying it, you’ll start to notice the effects 24-48 hours after use. So get this if you are looking for a simple solution for your lawn. 


  • Natural ingredients
  • Quick results
  • Long shelf life


  • Doesn’t last long
  • It kills 50%-75% of the weeds

Southern Ag 13503 Lawn Weed Killer with TRIMEC

#3 on our list is the Southern AG 13503. This product and the Southern AG Amine contain Trimec. Trimec is used to kill tough weeds such as poison ivy, spurge, and sheep sorrel. 

This product uses a mixture of 3 effective weed killers. It uses Mecoprop (5.3%), 2,4-D (3.05%), Dicamba (1.29%), and other ingredients (90.36%) to keep your lawn under control. Use this if you’re serious about reorganizing your lawn to your preferences.

To use this product, place 1.5 oz (per gallon) for each 400 squ. ft of northern grasses. Place 1- 1.5 oz (per gallon) for every 400. sq ft of southern grass. That way, you’ll keep your garden clean and free from weeds. 

While this product will put a dent in the weeds, you’ll have to increase the ratio. That means you’ll have to continuously spray over the targeted area to reach its desired effect. This can be frustrating for some users as it can take multiple tries before the weeds are fully removed. 

Get the Southern AG 13503 if you want something versatile and efficient. While it will take time to see results, continue to spray it throughout the week, and you’ll notice a change. Because of this, you should buy this product whenever you’re in need of lawn improvement. 


  • Controls broadleaf weeds
  • Simple application
  • Can be used on nine different turf types


  • Weeds regrow after application
  • Can kill grass and plants

Roundup For Lawns1 Ready to Use

Roundup For Lawns1 ranks #4 on our list. It’s formulated to kill northern grass types such as dandelion, crabgrass, yellow nutsedge, and clover. You’re getting a tool that keeps your garden in good condition by getting this product. 

The Roundup For Lawns1 can kill over 250 weeds in the garden. With such a large kill rate, it’s a no-brainer why consumers love this product. It is rainproof, and the user should notice changes within 3 hours after application. 

Users like the wand extension that comes with this device. It allows you to spray the weed killer thoroughly without having to bend over. Thus, making it a great product for older gardeners who want something easy on their back. 

To use this product, start applying it to weeds during their growth stage. This will prevent them from growing larger, killing them in the process. Avoid placing it on your plants as it will cause them to deteriorate. 

Mainly, the Roundup ForLawns1 is a great choice for garden management. It covers 1350 squ. Ft is good if you have a small to medium-sized weed patch. Through using this product, you’ll get an effective tool for keeping your lawn safe. 


  • Suited for Northern Grass
  • 1,350 squ. ft of coverage
  • Good for small-medium sized lawns


  • Can harm your grass
  • Toxic ingredients

Ortho WeedClear Lawn Weed Killer Ready to Spray

Last on our list is the Ortho WeedClear Lawn Weed Killer. It features the ability to kill over 200 broadleaf weeds (dandelions, clover, foxtail, etc.). Thus, giving you a lightweight weed killer at your fingertips. 

Another reason users like this product is its quick rainproofing time. When applied, it takes only 1 hour to rainproof the grass. This will help in moisture-rich areas where weeds tend to grow faster. 

Plus, it has over 5,000 squ. ft coverage, making it one of the most expensive weed killers on this list. This gives you enough space to get rid of unwanted weeds and prevent them from growing back. 

To use this product, start to spray it over the affected areas in your garden. Spray slowly, as you don’t want to irritate the plants surrounding it. By doing this technique, you’ll start to notice quick results.

Basically, the Ortho Weed Clear Lawn Weed Killer is an essential choice for lawn control. Since it can kill a myriad of weeds, you can use it to protect your plants from getting infected by them. So get this if you’re a lawn aficionado wanting to preserve your backyard. 


  • Kills 200+ weeds
  • 5,000 sq.ft coverage
  • 1 hour rain proofing time


  • Not effective on crabgrass
  • Poisonous Material

Things to consider when buying best weed killer for horse pasture


Weed infestations are a common problem in gardens. And you have to kill them quickly before they ruin the aesthetic value of your lawn or garden. 

First, you need to see how effective the herbicide is. This will allow you to determine if it’s effective for long-term weed growth prevention. 

When looking for an effective weed killer, check to see what chemicals are included. If you want to prevent a weed infestation, you’ll need the right ingredients. For example, some of the best herbicide chemicals are  Imazapyr and Glyphosate. Look for these ingredients when selecting your first herbicide. 


Size is an important aspect when it comes to herbicides. When considering size, you have to think of two important things: The proportion of the weed killers and how large the weeds are. 

You can determine the number of herbicides you can use on your lawn. Check out the size of your lawn and the size of the area. By doing this, you’ll be able to purchase a weed killer that can handle the weeds before they grow too large. 

Water Resistance

While you can opt for a cheap weed killer, it won’t be effective during the rain. This means that once it rains, you’ll have to wait for the lawn to reapply it. Not only does this waste time, but you’re forced to reapply the herbicide each time it rains outside.

The best weed killers for horse pasture are the ones that are long-lasting, quick to apply, and rain resistant. Try out the Roundup For Lawns1 if you need a herbicide during long seasons of rain. 

Types of Weed Killers

You must determine which type of weed killer you want to use for your horse pasture. Here are the most common forms:


Liquid weed killers work by being attached to a sprayer. It can be used for killing weeds in flower beds, borders, or lawns. It has a handheld sprayer with a trigger system to release the weed killer. Use this if you need to spray over weeds in your lawn quickly. 


Drop spreaders are used to place powder weed killers on your lawn. This is an effective method for spraying herbicide on lawns and additional large areas. The spreaders aren’t used for individual weeds, so only use them when there is a large infestation of weeds in your lawn. 


Gel herbicides are a more non-invasive weed killer. It kills the weeds by placing them onto the leaves. Once the leaves become brown, it will continue to kill the weed and prevent it from growing back quickly. 

When shopping, always check if the weed killer comes with a drop spreader or spray bottle. That way, you can ensure that you’re getting every needed to preserve your lawn. 

Residual vs. Systemic Weed Killers

Residual weed killers are applied to the soil and not the weeds. It aims to kill the weeds at the root and prevent them from growing again. The only downside is that once it is applied, it will stay ingrained in the soil for a long time (i.e., some herbicides can last up to 2 years!). 

Systemic Weed killers have a more direct approach. When applied, it affects the entire weed and not the soil. Once it infects the weed’s internal layer, it starts to get the roots as a way to halt future growth. 

When looking for a weed killer for horse pasture, try to see which one works best for your garden. Use systemic weed killers if you have fast-growing weeds in your lawn. For long-term weed removal, you should opt for residual weed killers. 


To conclude, there are many weed killers for horse pasture products at your disposal. Before buying, check your lawn and see what needs to be removed. That way, you can buy a product that can get the job done and keep your horse pasture clean. 


How Soon Can Horses Graze After Weed Killer?

Give your horses 7-10 days before allowing them to graze again. If you let them graze too early,

the toxins in the herbicide can lead to injury or death. So always give your horses a secondary

Habitat so they can eat until the herbicide grass is finished. 

Is Weed Killer Poisonous To Horses?

Weed killers can hurt your horses if they consume them. The chemicals inside the herbicides can cause long-term damage to their vital organs. Because of that, it’s best to keep them out of the pasture until the weed has been removed. 

Leave a Comment