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Your cart is empty.Take control of your outdoor space with Roundup® Weed & Grass Killer₄ Concentrate. It kills tough weeds and grasses to the root, including dandelion, large crabgrass, poison ivy, clover (red & white), spotted spurge, and other broadleaf weeds. It is rainproof in as fast as 30 minutes, produces visible results in hours, and allows you to plant 1 to 30 days after application (see booklet for details). Use Roundup® Weed & Grass Killer₄ Concentrate in flower beds, around trees, along fences, driveways and walkways, freshly cut woody stumps, in large areas for lawn replacement, garden plot preparation and other areas of your yard. Mix the concentrate according to label directions and spot treat or spray evenly each gallon of spray solution over 300 sq. ft. with a tank or hose-end sprayer. Do not allow people or pets to enter the treated area or touch treated plants until spray has dried. One 2.5 gal. bottle of Roundup® Weed & Grass Killer₄ Concentrate makes between 53 to 106 gallons (see booklet for mixing instructions) and covers up to 16,000 to 32,000 sq. ft.
Birdman
2025-08-13 14:16:06
Don't care what others say about Roundup and the cancer controversy, this stuff does the job on the first try every time. A bottle lasts me 2 sometimes 3 seasons. I got a great deal buying it through a SlickDeals discount, so almost half the price of big box stores.
Evan Michael Roth
2025-07-13 14:43:37
I've used this a few times diluted in a sprayer. Sprayed it on when the weather is looking dry for a couple days and let it sit.When I first used it I was worried because I didn't see results after a couple days. But let me tell you after a week or two, EVERYTHING I sprayed was decimated. Just be careful where you spray this stuff, it is strong and not selective. Love it for spot killing the weeds on my patio, steps, and driveway.
Chris Wagoner
2025-05-18 11:01:07
Well what can you say about weed and grass killer. right?? Well this stuff is better than some other brands I have tried. My home sits on about 2 acres in North FLorida and weeds and devils grass grows like crazy. Well My wife has several nice gardens and we weed as much as we can, but sometimes the weather makes the weeds grow faster than I can get to pulling it. So I got this to spray some areas that were getting out of control and to big to do by hand. Also along my fences.First follow the directions and mix it like they say, you do not want to mix it stronger than they say, it does not make it work any better then if mixed right. Also this does not work overnight like some of the older stuff did. This takes 4 or 5 days to kill the weeds and devils grass. I use a pump sprayer and you can spray this around flowers and good plants, as long as you do not let wind or overspray get on the good plants. It dries and is safe from rain after about 30 minutes.At first I did not think it was working, but after days the plants I had sprayed started to die. By 1 week they were dead. Works great. I bought the high concentrate type because I will use it a lot over the rainy season and to keep weeds and grass down along my fences and in the gardens.I highly recommend this to anyone looking to get rid of stubborn weeds and grass. It helps to keep the gardens weed free and looking nice..
Cliffmary
2025-05-12 14:11:58
Its a little pricey but will kill bamboo.
Frank
2025-01-16 18:47:58
I like round up and used this super concentrate for years. It only works in hotter temperatures so don't try it in late fall or early spring. 2 big warehouse stores don't carry the super concentrate anymore so bought on Amazon. It will last me as a spot weed control on 1/3 acre landscaped property for 2-3 years. So it's a great price looking at it that way. Don't try using this at 75° or under.
Manny de la Torre
2025-01-11 18:48:34
I usually buy Spectracide weed killer at HD. I wanted to buy something better and found out that the important ingredient in weed killer is glyphosate. This product has the highest concentration of glyphosate. I mixed it in a gallon sprayer according to instructions. Sprayed my garden and saw results within 3 days. I'm very satisfied.
Joseph W Hall
2024-12-30 11:18:51
Works well
Fran
2024-11-18 12:12:06
In the past I've only used the Extended Control Roundup concentrate, but bought this Super Concentrate Weed and Grass Killer this time to save some money, see how it would perform, and to be able to re-plant in the sprayed area sooner, if that's what we chose to do. We sprayed it in 2 different areas - one that was bulldozed about a year ago into a steep slope and now had tons of dandelions and some other taller weeds growing there and the other was an undisturbed flat area of mostly grass and some dandelions and lower weeds. Both were sprayed (saturated) with the 2.5 concentrate dilution in a pump tank sprayer, and took nearly a week for most everything to turn brown, but there were still a few listed weeds that never died. On the flat area, we then had a 4-5" layer of topsoil dumped and spread on top of the dead stuff. Weeks later that became covered with various types of weeds and growth, so we first weed whacked, then mowed and raked the area, then sprayed it with an even stronger dilution this time. That was now a week ago and it has a spotty brown dead and green still alive appearance. It looks like it would take another application to fully kill off everything. All spraying was done in sunny weather with no rain for at least 1-2 days afterwards, which should have been ideal, as it says sunny weather is preferred and that it is rain proof in 1/2 hour. This Roundup concentrate was good to clear out a decent portion of the unwanted growth, but not all of it. When I've used the Extended Control Roundup concentrate, it has killed everything and much quicker and lasts for at least 4 months, which is not good if you want to re-plant the area sooner than that, but is good if you're looking for a long-term cleared area. Based on my experience, I would be hesitant to recommend this Roundup Super Concentrate Grass and Weed Killer, unless maybe if you were only going to use it on a grassy area with no or very few common weeds.
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