The 7 Best Weed Killers for Gravel, Tested and Reviewed

Even with a weed barrier in place, using a weed killer for gravel is often the most effective way to keep driveways and pathways clear of unwanted growth. Over time, dust and dirt settle into gravel, giving weed seeds the foothold they need to germinate and spread.

But with hundreds of different weed killers available in stores and online, finding one that’s both safe and effective can be a challenge. To help you narrow down your options, we tested seven popular products, monitoring their effects after 1 hour, 1 day, and 1 week. Based on our results, we selected the Natural Armor All-Natural Weed & Grass Killer as the best overall option for its powerful performance and non-toxic formula. Ahead, see which other lawn care products we recommend as the best weed killers for gravel.

1. BEST OVERALL: Natural Armor All-Natural Weed & Grass Killer
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2. RUNNER-UP: Natria Grass & Weed Control With Root Kill
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3. BEST BANG FOR THE BUCK: Energen Carolina Vinegar Weed & Grass Killer 
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4. BEST ORGANIC: Sunday Weed Warrior 
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5. BEST PET-SAFE: Natural Elements Non-Toxic Weed Killer
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6. BEST FAST-ACTING: Ortho GroundClear Weed & Grass Killer
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7. BEST ROOT-KILLING: Spectracide Weed and Grass Killer RTU Liquid
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Before You Buy Weed Killer for Gravel

Safety is an important consideration when buying weed killers, as some formulas pose greater risks to people, pets, and the environment than others. 

On the environmental side, some chemical weed killers contain toxic ingredients that linger in soil for months to years, potentially impacting surrounding lawns and landscaping as well as wildlife in nearby lakes, ponds, or streams. Contact herbicides that rely on ingredients like salt, acetic acid (vinegar), and fatty acid soaps break down in days to weeks, making them safer.

In terms of direct health risks, all weed killers can cause harm if ingested, so it’s essential to store them out of reach of children. Additionally, some synthetic systemic herbicides can be toxic or fatal if inhaled or absorbed through the skin, so always read the label to prevent accidental exposure to people and pets. 

Weed Killers for Gravel Comparison Table

Our Top Picks

The following products for gravel driveway weed control earned their place on our list through hands-on testing for performance and ease of use. Each one contains proven ingredients that effectively tackled common weeds that grow in gravel. 

Natural Armor’s nontoxic weed killer is our favorite weed killer for gravel because it’s powerful enough to get rid of over 250 types of weeds and grasses, yet doesn’t use harsh chemicals or require messy mixing. In addition to its active ingredients of salt, citric acid, and clove oil, it also contains soap (sodium lauryl sulfate), which helps it spread more effectively and increases absorption. After spraying it on grass, dandelions, and small weeds sprouting in our gravel driveway, we started seeing results within a couple of hours, with full die-off taking about a day. 

Natural Armor is available in several sizes, including ready-to-use sprays for easy application and economically priced refill jugs. Like other nonselective weed killers, its overspray can damage desirable plants, so use care during application. Also note that it worked best on younger weeds in our tests, so we recommend spraying as soon as you see something sprout to avoid the need for repeat applications. 

Get the Natural Armor weed killer for gravel (various sizes) at Amazon, Walmart, or Natural Armor.

Those seeking eco-friendly options for removing weeds from gravel driveways and paths will want to consider Natria’s grass and weed control product. The ready-to-use weed killer spray comes in a 1-gallon jug with an attached sprayer that makes treating large areas quick and easy. Its active ingredients, ammoniated soap of fatty acids and maleic hydrazine, penetrate deep into plants’ cellular structure, reaching the roots for a thorough kill. Best of all, the fatty acids break down within 5 days, leaving no lingering environmental impacts.

During our tests, this was one of the easiest products to apply—once we figured out that the batteries in the wand had arrived dead. After inserting four fresh double-As, though, the sprayer worked perfectly. This weed control for lawns​ and gravel proved equally effective on both large and small weeds, showing visible dehydration and browning in just a few hours. When I checked the treated areas the next day, everything was fully withered and dry. While Natria is an eco-friendly weed killer, you’ll still want to avoid getting it on nearby plants or grass, as it’s nonselective and will kill them along with unwanted weeds. 

Get the Natria weed killer for gravel (various bottle types) at Amazon or Ace Hardware.

Many organic herbicides for weeds come at a premium price, often costing several times more than chemical-based alternatives. Energen is an exception, earning its place on our list as a budget-friendly, heavy-duty weed killer that delivers excellent, eco-friendly results without a high price tag. Those looking for a weed treatment for lawn or garden areas, gravel driveways, or flower beds will find it not only effective but safe, as its primary ingredient is industrial-grade vinegar (acetic acid).

In testing, this pick did a fantastic job killing weeds of all sizes as well as grass sprouting up between rocks. A little goes a long way, which is nice since the spray bottle we put it in (the jug doesn’t come with its own) was a bit tiring to squeeze. While the 20-percent vinegar formula is suitable for organic gardening, it’s highly acidic and can cause burns if contacted directly. Wearing eye protection and covering exposed skin is recommended during use, and the area is safe for kids and pets once the product dries.

Get the Energen Carolina weed killer for gravel at Amazon.

Sunday’s Weed Warrior spot treatment is a fast-acting, nonselective weed killer that starts causing visible die-off in mere minutes. The formula uses ammoniated soap of fatty acids as its active ingredient, which works by stripping the waxy coating that protects leafy vegetation, causing it to dry out and die. Weed Warrior is powerful enough to treat algae, bluegrass, stinkweed, thistle, lambsquarters, lichen, crabgrass, dandelions, and more, yet it’s also listed by the Organic Materials Review Institute (OMRI) as safe for organic gardening.

This ready-to-use weed and grass killer is sold in spray bottles and gallon-size refills, though we found the 32-ounce bottle impractical for anything other than isolated spot treatment. Also, while weeds did start to wilt within about 20 minutes, complete death took closer to 48 hours. Like many products on this list, it worked best on early-growth weeds under 5 inches, and larger weeds needed more than one application. After treatment, the area stayed weed-free for about 21 days before new seedlings appeared. 

Get the Sunday weed killer for gravel (various sizes) at Amazon, The Home Depot, Target, or Sunday.

With sodium chloride as its active ingredient, the Natural Elements weed killer is a people- and pet-friendly option for ridding gravel pads of unwanted plants. Though it relies primarily on salt, this nontoxic formula also includes a bit of commercial-grade vinegar and soap, which provide an extra boost that results in near-immediate wilting. 

In our tests, this was the perfect solution for a landscaped area in our backyard where our dogs love to play. More grass has been sprouting up between the gravel over the years, making it look messy and pulling focus from our peonies and poppies. Just one day after treatment, I struggled to see where the grass had been, but since I was careful where I applied it, none of my desirable plants had been harmed. The only downside is that the bottle doesn’t come with a sprayer, so you’ll need your own for application. 

Get the Natural Elements weed killer for gravel at Amazon or Natural Elements.

If you need a solution that works almost instantly, Ortho GroundClear is the one to reach for. This OMRI-listed herbicide uses ammonium nonanoate to deliver visible results in as little as 15 minutes, making it ideal for clearing driveways, walkways, and landscape beds. It targets a wide variety of unwanted growth, including crabgrass, dandelions, moss, and algae. Since the formula is rainproof in just 2 hours once dry, you don’t have to worry about a sudden shower washing away your hard work.

During our tests, this was another incredibly easy option to apply thanks to the battery-powered wand. The applicator delivered a continuous, precise spray that made it easy to target only the plants I wanted without any hand fatigue. It also worked so quickly and completely that it was hard for me to find the weeds I’d treated when I went outside to check the progress. The price is excellent, and kids and pets are safe to enter the area once the product has completely dried.

Get the Ortho weed killer for gravel (various sizes) at Amazon, Lowe’s, Ace Hardware, The Home Depot, or Walmart.

Spectracide is a solid choice if your priority is a deep, systemic kill that prevents stubborn weeds from returning. This nonselective herbicide targets plants’ root systems directly, ensuring that once weeds brown, they won’t simply sprout back from the same spot a week later. The formula is designed to be rainproof in just 15 minutes and show visible wilting within 3 hours. It also offers one of the quickest turnarounds for landscaping, allowing you to add plants to the treated area after just 24 hours.

Spectracide’s root-killing power lived up to the claims in our tests, with weeds showing no new growth after a week. We did find the application a bit labor-intensive, though, as the attached sprayer is manual and attached by only about 5 inches of tubing, which sometimes made it hard to find the right angle between the gallon jug and the weed on the ground. It also contains one of the most irritating active ingredients (diquat dibromide) of all the products on our list, so you’ll want to wear gloves and long sleeves to avoid accidental contact. Still, the price is excellent for a product that won’t have you out there every other week targeting the same areas you did before.

Get the Spectracide weed killer for gravel (various sizes) at Lowe’s, Tractor Supply Co., Ace Hardware, The Home Depot, Walmart, or Target. 

Or, DIY Your Own Weed Killer

Before commercial weed killers, people relied on homemade formulas to kill weeds naturally. Many of those homemade formulas are still worth trying today. These eco-friendly and nontoxic weed killer options often include ingredients like borax, salt, vinegar, and dish soap.

• Borax: Sodium borate, or borax, is a naturally occurring mineral with an alkalinity of about 9.5. This is high enough to make it lethal to most weeds, whose pH is often between 6 and 7. Spraying weeds with a simple solution made of borax and water will usually get rid of them. 
• Salt: Common table salt disrupts a plant’s water balance, causing it to wither. While effective, salt lingers in soil and prevents new growth, making it a poor weed killer for flower beds and other areas where beneficial plants grow, but good for driveways and walkways.
• Vinegar: Though weaker than the industrial version (acetic acid), household vinegar kills weeds when used at full strength or diluted 1:1 with water and sprayed on foliage. 
• Dish soap: By itself, liquid dish soap may not effectively kill weeds, but adding a few drops to other homemade formulas helps them stick better to the foliage for absorption into the plant. 

Jump to Our Top Picks

FAQs

Unwanted weeds can spread quickly, turning a good-looking gravel path into a shoddy mess. If you’re not quite ready to buy a weed torch and still have a few questions about gravel weed killers, the answers below could help.

Q. What is the best weed killer for my gravel driveway?

The Natural Armor weed killer for gravel uses salt to kill a wide array of weeds and a surfactant to help it stick and be absorbed more effectively, making it one of the best all-around products for removing weeds from gravel driveways.

Q. How do I use weed killer on gravel?

Follow the manufacturer’s directions, applying the product at the recommended rate and under the right conditions. Keep in mind that granular weed killer may require watering afterward, and some sprays shouldn’t be applied when rain is in the forecast.

Q. Will weed killer for gravel damage the soil?

It could temporarily damage the soil, depending on the product used. Some products leave residual traces behind that keep future weeds (and all plants) from growing for a few months to a year.

Q. Is it better to spray weed killer wet or dry?

It’s best to spray weed killer when plants are dry and there’s no rain in the immediate forecast. This ensures the weed killer spray is applied at maximum strength, and that it has enough time to work without the risk of being washed away.

Q. What time of day is best to apply weed killer?

The best time of day to apply weed killer is usually in the afternoon or evening when temperatures are higher and the weeds are dry. It’s also smart to spray weed killers when it’s calm to prevent overspray from landing on plants you’d like to keep.

Meet the Tester

Michelle Larson has spent over a decade writing and editing across the health, business, and home sectors, though her heart is still in the flower shop and greenhouse she worked at throughout college. Because she’d rather spend a little more up front than buy a tool or appliance twice, she believes strongly in the power of research and testing for finding quality items that are meant to last. 

Additional research provided by Glenda Taylor and Tony Carrick.

 

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