By Glenda Taylor and Tony Carrick | Updated Mar 2, 2023 2:30 PM

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Depending on which area of the country you call home, a variety of brushwood species could be spreading along your fence lines or growing into impassable thickets in your yard. Left to their own devices, brush—a combination of saplings, conifers, young trees, and invasive vines—can quickly encroach on little-used parts of the property until you can ignore it no longer. Trying to chop and dig the weeds out is a labor-intensive task, and some brush varieties may regrow if roots remain.

That’s where brush killers come in. These herbicides, which can be organic or synthetic, should be strong enough to banish even invasive brushwood species. Selecting the best brush killer for your needs will depend on the type of brush you’re dealing with, the extent of the problem, and your preferred method of application. Ahead, learn what to look for when buying a brush killer and find out why the following products are all excellent at eradicating tough weeds.

While herbicides are one means of clearing brush, brush killer isn’t always the most effective solution. Brush killers can take a week or more to banish woody plants, kudzu, poison oak, and poison ivy. They also often require multiple treatments, especially if the brush is particularly dense or tall. Plus, unless shoppers go with an organic product, brush killers introduce harmful chemicals, such as glyphosate, triclopyr, and fluazifop, into the environment, which can hurt wildlife.

Organic brush killers use ingredients that biodegrade quickly in the environment, including seawater, vinegar, and small amounts of mild dish soap. While organic products may not take out brush as quickly as chemical-based products, they are far less harmful to wildlife as well as safer to use and store in a home with pets and kids.

That said, shoppers may prefer to avoid using a brush killer entirely in favor of physically removing the offending weeds. While a lawn mower and line trimmer may not be equipped for such a job, there are machines designed to take down brush. Field and brush mowers will cut through dense vegetation and can even cut through saplings up to 3 inches thick. While these machines are too expensive for nonprofessionals to purchase, many garden centers and home improvement stores rent them for a nominal fee.

If shoppers would rather not rent a brush mower, they might be able to convert their line trimmer into a more powerful machine capable of handling the job. Some string line trimmers can be fitted with serious cutting blades that can slice through dense vegetation.

Brush, poison ivy, weeds, stumps, and other harmful plants can damage the integrity and aesthetic of an outdoor space and plants. The right brush killer can remove all noxious plants with the aid of potent ingredients, long working times, and water resistance.

Many of the above picks are made with triclopyr; glyphosate; 2,4-D; or combinations of these chemicals for effective weed killing. Some also contain weed-preventing chemicals to keep noxious plants from regrowing. These potent formulas typically have rainproof abilities to last through most weather conditions.

The above selection is also versatile, as most brush killers are able to wipe out a variety of harmful plant types simultaneously, and the effects can last for up to 1 year after application. Many of the above picks are concentrated, requiring dilution before use, so most come in lightweight quantities, but multiple size options are typically available. Also note that while brush killers are liquid formulas, not all products come with spray nozzles or wands for application. Those that don’t should be poured into a spray bottle using a funnel to prevent spills.

A brush killer should live up to its name and be potent enough to kill the offending varieties of brush. The following products will all kill most types of brush, and one or more is sure to be an asset in helping eradicate the woody overgrowth on a property. This list consists of mainly organic options that will eliminate brush without leaving behind chemicals that can hurt wildlife.

A formula that’s both effective and organic makes Doctor Kirchner’s Natural Weed & Grass Killer the best brush killer on the market. It’s made from simple ingredients, including ocean salt water, commercial-strength vinegar, and soap. While it may not have the immediate brush-killing power of some chemical-based herbicides (multiple applications will likely be necessary to take out the vines and dense shrubs that classify as brush), it’s much safer for the environment, pets, and people.

This nonselective brush killer is ready to use out of the bottle and requires no messy mixing. It’s also available in a broad range of sizes—including a 640-ounce bottle that’s ideal for covering large areas of brush—to suit jobs both small and large.

Get the Doctor Kirchner brush killer at Amazon.

With its mix of commercial-grade vinegar and salt water, Natural Elements is a powerful herbicide with ingredients that fortunately biodegrade quickly. Natural Elements will kill most broadleaf weeds and grasses, making it ideal for use as a brush killer. It also comes ready to use with no mixing required. Simply add the liquid herbicide to a sprayer and saturate the leaves of weeds and unwanted grass. Weeds will begin to brown and wilt in 24 hours. Natural Elements is available in 1-gallon containers.

While Natural Elements Weed Killer doesn’t present the same hazards as chemical herbicides, it does use highly concentrated vinegar, which can cause severe burns if exposed to the skin. Users should wear eye protection and gloves and cover exposed skin during application.

Get the Natural Elements brush killer at Amazon.

Earth’s Ally is very similar to other organic herbicides in that it uses a mix of salt water, vinegar, and soap to kill weeds. What differentiates this weed killer from the competition is its notably lower price tag. Earth’s Ally, which comes in 1-gallon bottles, is effective against broadleaf weeds, including tough ivy and chickweed. Plants will begin to wilt just hours after application.

Earth’s Ally leaves a comparably smaller impact on the environment than chemical-based herbicides, and it’s safe for use around pets and people. It comes premixed and includes a handy sprayer, making it easy to use and an even better bargain.

Get the Earth’s Ally brush killer at Lowe’s.

Natural Armor stands out from the field of organic herbicides with its use of multiple natural ingredients to kill weeds. In addition to sodium chloride and vinegar, common ingredients in other environmentally friendly weed killers, Natural Armor also uses citric acid and clove oil for an extra weed-walloping punch.

Simply coat weeds with Natural Armor using the included spray attachment—no mixing required. Weeds begin to show distress in just a few hours, though denser weeds and brush may require more than one application. Natural Armor is available in 2.5-gallon bottles that include a sprayer.

Get the Natural Armor brush killer at Amazon.

Green Gobbler uses a high concentration of 20 percent vinegar and a trigger spray with an adjustable nozzle to wage its assault on weeds and brush. This high concentration of acetic acid is effective at taking out stubborn brush, including vines and a host of broadleaf weeds and grasses. A nozzle that adjusts from spray to stream allows the user to target large and small weeds while limiting overspray. Green Gobbler kills quickly, with weeds drying out in less than 24 hours.

Its environmentally friendly ingredients make it safe to use anywhere, including vegetable gardens, flower beds, and driveways. Protective eyewear and clothing that covers exposed skin should be worn when applying the product due to its high concentration of acetic acid. Green Gobbler requires no mixing; the 1-gallon size includes the tough trigger sprayer, and 2-gallon refill bottles are also available.

Get the Green Gobbler brush killer at Amazon or The Home Depot (32 ounces).

While OrganicMatters relies on salt water and vinegar as other organic herbicides do, it can wipe out more types of weeds thanks to the addition of some potent yet less common ingredients. Its formula includes two ingredients that give it an added punch—clove oil, which is especially effective against broadleaf weeds, and lemon juice, which dries out weeds.

OrganicMatters is premixed and ready to use straight out of the 1-gallon bottle, though it must be poured into a spray bottle since a trigger is not included. It starts killing weeds in less than 24 hours; however, heavier brush may require several applications to finish it off.

Get the OrganicMatters brush killer at Amazon.

While organic options present the safest and most environmentally friendly options for killing brush, they generally aren’t as effective against dense brush as chemical herbicides.

With its active ingredients triclopyr and triethylamine salt, BioAdvanced is one of the best brush killers for taking out such stubborn plants as poison ivy, kudzu, blackberries, and poison oak. This spray-on herbicide also works quickly, in just a few hours, making it less vulnerable to rain. Although triclopyr is considered to be safer than some other chemical herbicides, it’s nonetheless somewhat toxic to some birds, mammals, insects, and marine life, according to the Environmental Protection Agency (EPA). As such, it’s crucial that users carefully follow product instructions when mixing and applying it.

Get the BioAdvanced brush killer at Amazon (24 ounces) or The Home Depot (1 gallon).

Many commercial herbicides contain glyphosate, which is toxic to animals, so they’re a poor choice for those with dogs or cats that go outside or have wildlife roaming their property. Just For Pets Pet-Safe Weed Killer Spray only uses natural ingredients, making it a safer option for pet owners (though its active ingredients are basically the same as other organic weed killers).

This product uses a mix of vinegar, salt water, and clove oil to kill weeds and is ready to use straight out of the bottle. To apply, use the included sprayer attachment to saturate offending weeds. While clove oil does have the potential to cause skin irritations, it is safer for pets than synthetic chemical herbicides.

Get the Just For Pets brush killer at Amazon.

Most organic brush killers use active ingredients that folks typically have in their kitchen pantries—salt, vinegar, dish soap—which means replicating them is fairly easy.

To create a homemade brush killer, mix a gallon of vinegar with 1 tablespoon of dish soap and 1 cup of table salt in a spray bottle. For an even stronger solution, consider purchasing horticultural vinegar, which has a concentration level of 20 percent, significantly higher than the 5 percent vinegar available at the grocery store.

Just keep in mind that this higher concentration of vinegar is much more acidic and therefore has the potential to cause serious eye and skin burns. When using high-concentration vinegar, wear protective eyewear and cover all exposed skin.

Apply the vinegar-salt-soap solution to weeds on a warm, sunny day when the heat will help with the dehydration process.

There are other common brush killers, including Roundup Ready-to-Use brush killer, Southern Ag CROSSBOW brush killer, and RM43 brush killer. However, they do not meet our sustainability guidelines and are not recommended in our top picks due to their harmful ingredients and danger to humans and pets. Doctor Kirchner’s brush killer is not only an effective means of wiping out brush, but it also uses ingredients that are safer for people, animals, and the environment than chemical-based brush killers. That’s why it took our Best Overall spot. While some organic herbicides can be pretty pricey, the Earth’s Ally brush killer uses a similar formula to the competition yet costs less.

An untended yard can become a dense jungle of vines and wild bushes within a few short months. When that happens, it will likely be impossible to clean up the property with a mere mower or weed wacker. Organic weed killers and chemical herbicides are both capable of taking out dense brush. Before buying, however, it’s important to think about the best type and application method for each situation and the safety considerations involved with various products.

Some types of brush killers are better suited than others to specific situations. Some folks have only a small area to clear, while others might have an acre or more. Fortunately, buyers have a choice.

Weed killers come in synthetic-chemical and organic options. While chemical-based products are more powerful and therefore more efficient at killing shrubs, vines, saplings, woody plants, and weeds, organic options are gentler on the environment and safer for people and pets.

Most chemical brush killers contain one or more of the following chemicals:

While chemical herbicides are more effective at killing brush, they also have much greater potential to impact the environment negatively. Triclopyr and fluazifop are considered to be milder than other chemical herbicides, but they still present a hazard to wildlife. Glyphosate, a common ingredient in most chemical herbicides, has been listed as probably carcinogenic (i.e., a cancer-causing agent) to humans by the International Agency for Research on Cancer, though the EPA states that there is no evidence that ingesting glyphosate leads to cancer. Glyphosate also poses a significant threat to wildlife.

Organic brush killers, in comparison, use natural ingredients that biodegrade quickly, posing much less of a threat to wildlife. Most organic brush killers contain the following ingredients.

Applying an herbicide just before it rains can cause the product to wash away before it can kill the offending plants. That’s why some of today’s herbicide products are designed to be rainproof within a few hours of application. Depending on the product, an herbicide can become rainproof in as little as 30 minutes or up to 24 hours.

Patience pays off when using an herbicide to kill brush. Some types of brush, especially tender vines and grassy weeds, may begin wilting within a couple of days. Woody and thorny bushes with hardwood stems or trunks, though, may not show signs of dying for up to 6 weeks. Wait it out—there’s usually no need to reapply the herbicide. In some cases, the product’s label may even recommend against reapplication for a specific amount of time, such as 30 to 60 days.

Commercial brush-killing products are considered to be safe when used as directed. Keep in mind that these are potent chemicals, and care is required when applying them—careful application protects the user as well as pets, children, and the environment. What’s more, neglecting to follow usage instructions on an herbicide label may even be a federal offense. Herbicide labels bear this warning: “It is a violation of federal law to use this product in a manner inconsistent with its labeling.” It also makes good sense to follow some safe-application tips.

Unwanted vines and brush can take over a plot of land quickly. When they become too thick and tough to remove with a mower or brush cutter, many shoppers opt to use chemical weed and brush killer products. Here are answers to some common questions about brush killers.

Yes, herbicides kill a wide range of plants, and overspray can kill grass and other desirable plants. So use caution and don’t apply herbicide when it’s windy.

Some are safer than others. Always read and follow the label’s safety precautions, and don’t allow children or pets in the area until the recommended amount of time has passed.

When foliage is saturated, many brush killers start working almost immediately. Still, it can take time for the herbicide to travel from the leaves through the stems, trunks, and roots. Wilting may be evident in 24 hours, but the entire plant may not die for up to 6 weeks.

Typically, only one application is necessary, but success depends on several factors. If the wrong type of product is used, it may never kill the offending brush; if rain washes the herbicide off too soon, reapplication may be necessary. Always read the product’s label, because it may be a violation of federal law to reapply specific herbicides before a certain amount of time (specified on the label) has passed.

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