Roundup Weed and Grass Killer Review

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For most homeowners, managing weed growth is a challenge. Unlike grass and other types of plants, weeds germinate quickly and grow at an almost uncontrollable rate. Their hardiness enables them to grow in a wide variety of soil types, and as they grow, they starve the soil of nutrients that grass needs to thrive. If your lawn is currently suffering from a similar problem, then it is time to take your weed control efforts to the next level with a commercial grade weed killer. At the same time, it is important to select your weed killer carefully. A second rate brand will only offer a temporary respite from weeds.

Roundup Weed and Grass Killer has long been one of America’s favorite brands of weed killer. It’s super-concentrated formula destroys weeds at their root to safeguard against a potential return. Weeds absorb the formula through their leaves, which also ensures that it will reach the plant’s root system. Affordable, proven, and simple to use, Roundup Weed and Grass Killer offers a guaranteed method of ensuring that your mulched flower beds, patio, and driveway will always look pristine.

Roundup Weed and Grass Killer Super Concentrate, 35.2-Ounce
277 Reviews
Roundup Weed and Grass Killer Super Concentrate, 35.2-Ounce
  • Best Roundup brand concentrate value for really widespread weed problems
  • For use in tank sprayers. For best results add 2 1/2 oz. per 1 gallon of water.
  • For use around flowers, shrubs and trees; on patios, walkways, driveways, gravel areas and mulch...
  • Rainproof in 30 minutes


  • Roundup Weed and Grass Killer offers an affordable method of weed control.
  • A single quart will make up to 10 gallons of solution, which makes it ideal for treating large areas of land.
  • Because the formula is absorbed through the stem and leaf only, it won’t harm non-targeted plants through the soil.


  • At times, a second application was needed to kill all the weeds.


  • This formula will rainproof in as little as 30 minutes.
  • Noticeable results will be achieved within 12 hours, with weeds fully dying in 2 to 4 days.
  • The ingredients used in this formula target an enzyme found in plants, but not pets or people.


Available in 35.2 ounces, half a gallon, and 1 gallon concentrates, Roundup Weed and Grass Killer has been used by generations of Americans as a reputable and cost-effective weed killer. It is ranked as one of Amazon’s best-selling lawn and garden maintenance products. If your lawn is currently populated with weeds that have compromised the value of your home, this product will quickly and ruthlessly solve your problem once and for all.

Because it kills irritants from within the root, the results are permanent. Most comparable brands only cause weeds to wilt, rather than kill it.

Roundup Weed and Grass Killer boasts Roundup’s patented FastAct formula. Rather than waiting weeks or months to restore your lawn’s lackluster appearance, the FastAct formula will begin to produce results within 12 hours. The majority of weeds will be dead within 2 to 4 days. It will continue to work over time to prevent the growth of new weeds. Within 30 minutes of application, this product will become rainproof, and should any accidentally come into contact with your driveway, plants, or ornamental lawn decorations, you do not have to worry about the formula harming them.

The primary active ingredients in this formula are glyphosate (50.2%) and diquat (.73%). Glyphosate was specially selected for its ability to target an enzyme that is found only in plants – not in humans or animals. A single quart of this concentrate will produce up to 10 gallons of treatment, which makes it ideal for large scale projects.

Once the concentrate has been mixed according to the included instructions, a tank sprayer should be used to distribute the product on the desired areas. Should the weed killer accidentally be applied to a plant, you want to keep, the plant should be immediately and thoroughly rinsed off with water. Ideally, this solution should be applied when weeds are actively growing, and the best results will be achieved when it is sunny, and the temperature is above 65 degrees Fahrenheit. It should be sprayed only when there is no wind to prevent the formula from being sprayed on desirable plants.

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At the time of this writing, 79% of reviewers have given Roundup Weed and Grass Killer a four or five-star review. A small percentage of users have complained that the weed killer was ineffective or must be blended with a higher concentrate to achieve the desired results; however, the reviews have largely been overwhelmingly positive.

Roundup offers a money back guarantee if you are not satisfied with the results it produces. With its affordable price, proven track record, and money back guarantee, you have nothing to lose by trying Roundup Weed and Grass Killer (except for a few weeds!).

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