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Spectracide Weed And Grass Killer Review

The Spectracide brand will aid in the eradication of weeds and grasses. It’s available in a variety of sizes and can be used wherever weeds are an issue. This covers areas such as walkways, driveways, and fences.
Spectracide Weed & Grass Killer Concentrate, 64 fl ozFeatures of Spectracide Weed And Grass Killer:

  • Diquat Dibromide2: 30%
  • Fluazifop-p-butyl1: 15%
  • Dicamba, dimethylamine salt: 0.77%



Spectracide Weed & Grass Killer is just a non-selective herbicide that kills whatever plant it comes into contact with. The toxin reaches the plants from the leaves, then goes to the roots. It means that the plant can’t grow back and it destroys the roots. Make sure you don’t have this on some plants you don’t want to die.

Active components

The main components in the Spectracide Weed and Grass Killer: 

  • Dicamba, dimethylamine salt 0.04%;
  • Diquat dibromide 0.12%;
  • Fluazifop-P-butyl 0.06%;
  • Oxyfluorfen 0.1%;

Fluazifop-p-butyl has been used for a long time and is completely secure to use in the home. Most herbicides don’t have a grass killer component in addition to the broadleaf weed killer ingredients, but this one is unique. This is a fine commodity to rotate through your arsenal if you have a lot of grassy weeds.

Fluazifop-p-butyl destroys annual and seasonal grasses but does little or no damage to broad-leaved plants (dicots), according to the Center for Invasive Species. It kills by preventing lipid synthesis (lipids are essential parts of cell membranes), especially at active growth sites. Fluazifop-p-butyl is mainly degraded in the atmosphere through microbial metabolism and hydrolysis. It is not easily degraded by radiation. Fluazifop-p-butyl has a half-life of one to two weeks in soil.

This non-selective contact herbicide uses diquat dibromide, a fast-acting herbicide, to kill weeds and other plants on contact.


  • Destroys the entire plants to the roots;
  • 64 ounces can be diluted to 20 gallons;
  • Work on almost any terrain;
  • The first results in 3 hours;
  • Becomes rainproof in 15 minutes;
  • Should be applied with a tank sprayer;
  • Not for sale in Vermont and New Hampshire; 

What weeds can it kill? 

The Spectracide Weed and Grass Killer can cope with such vegetation:

  • Bluegrass;
  • Clover;
  • Ivy;
  • Dandelions;
  • Bluegrass;
  • Foxtail;
  • Crabgrass;
  • Dog fennel;
  • Buttercup;
  • Wild mustard;
  • Yellow oxalis;
  • Thistle;
  • Wild blackberry;
  • Wild carrot;
  • Cudweed;
  • Nutgrass;
  • Barley;
  • Zoysia;

It may destroy perennial and annual weeds to the root. Use caution when working in or near edible feeds or food crops.

How to use it?

Spectracide Weed and Grass Killer is a pre-mixed, ready-to-use weed and grass killer designed for spot weed and grass management. Dilute 10 teaspoons of liquid concentrate in one gallon of water and blast weed vegetation with a tank sprayer.

Mix with water and spread with a tank sprayer according to the product label’s instructions. Apply the target vegetation fully. 

For at least 7 days after application, do not mow, slash, or otherwise damage treated vegetation.

This is a concentrated formula of weed/grass killer. That means you’ll need to blend it with water and use a tank sprayer to apply it. To have the greatest performance, make sure you fully treat the leaves, stems and roots of the plants you choose to get rid of while spraying.

Spot weed control in developed lawns is not advised since lawn grasses would be destroyed as well.

Tips for applying this Spectracide product:

  • Make sure to soak the leaves, stems of the target plant fully;
  • In as early as three hours after being sprayed, plants tend to yellow and wilt, with full destruction, such as the roots, taking 1-2 weeks;
  • Cover treated areas completely to avoid new grasses and weeds from sprouting;
  • A sheet of plastic or cardboard may be used to protect useful plants;
  • If suitable plants are mistakenly sprayed, instantly wash them with water;

When to use it?

  • It is recommended to apply this product on sunny and warm days when the temperature is over 60 degrees Fahrenheit. The best season to apply is when the weeds are growing actively;
  • To avoid the unintentional spreading of the product, use it on a calm day;
  • It is not recommended to mow or cut the treated weeds during 7 days after the application;
  • Never apply on food crops or edibles;
  • Never apply in areas where you are going to seed or plant something in 3 months;
  • Not for the use on newly planted shrubs, flowers and trees;
  • It is not allowed to use the product more than twice per year;

Where to use it? 

You should also use it in the flowerbeds, bushes, and shrubs even if it contains chemicals. This approach can be used on patios, walkways, and driveways, as well as around flowers, shrubs, and plants. Use it around walls and foundations and in large areas. You may even spray it to kill weeds in your flower garden. But before protect the useful plants with a piece of cardboard/plastic and spray while the weather is calm to prevent drift to attractive ornamental plants or trees.

This spray can be applied on a variety of surfaces, including trees, rocks, concrete, bricks, and so on.

How long does it take to work? 

Concentrate2 by Spectracide is a weed and grass killer that produces noticeable effects in 3 hours after being sprayed. On the next day, it is allowed to plant new flowers, trees, and shrubs in the treated field. It usually takes 24 hours for the product to take effect, then you should re-apply it after 7 days.

Spectracide Weed And Grass Killer User Manual

Having problem? Download Spectracide Weed & Grass Killer Concentrate instructions.

Pros & Cons of Spectracide

  • It is an RTU product;
  • Includes a spray nozzle;
  • Quickly becomes rainproof;
  • The visible results on the application day;
  • Works faster than most herbicides;
  • Covers a large area;
  • Budget-friendly;
  • Kills unwanted weeds and grass that are difficult to mow
  • Rainproof in 15 minutes
  • Visible results in 3 hours
  • Plant new flower, trees and shrubs in treated area after just one day
  • Won’t cope with all weeds like Roundup;
  • Sometimes needs a few applications;
  • Not “green”;
  • Not pet-friendly;
  • Sometimes doesn’t kill the root

This Spectracide herbicide is both effective and affordable. It can be used almost everywhere and the first results may appear on the same day when it was applied. However, it is not “green” – you have to protect pets, kids and your body from its fumes and spills. 

The Buyer’s Guide

Mode of action

Spectracide Weed & Grass Killer as a non-selective herbicide kills whatever plant it comes into contact with. It reaches vegetation through the leaves and spreads all the way down to the roots. This will mean that the plant is completely destroyed. 

Since it can kill any trees, you’ll need to use a piece of plastic or cardboard to cover suitable plants and vegetation. If suitable plants are mistakenly sprayed, automatically wash them with water. However, since this herbicide has no soil operation, it would not damage surrounding plants.

The rainproof feature

The weather is a source of concern for many people. It’s impossible to predict when it will rain. Rogue rain clouds are still a possibility, so check your local forecast.

You won’t have to be concerned with this product. It’ll become dry for 15 minutes after you’ve applied it. As a result, whether it floods or you fail to water the lawn, it won’t wash out.


This weed killer is good at destroying the root of the weed, which not all weed killers are. While other products just kill the leaves to which they are sprayed, this one kills the root, preventing it from growing back. Spectracide is so confident of the efficacy of their simple formula that they’ll refund your money if you’re not satisfied with the performance. It’s worth noting that the product does well when used on humid, dry days.


What is the difference between the Spectracide herbicide and Roundup? 

The biggest distinction between Spectracide and Roundup is that Roundup destroys the whole weed, including the seeds, while Spectracide just kills the portion of the weed that it comes into contact with. Spectracide is a potentially better alternative to Roundup since it does not remain in soil or water.

How soon can you let pets on the lawn after using this product? 

Pets and kids should stay away from the sprayed areas before the spray has dried entirely. You will use your grass, patio, or sidewalk as normal until the treated lawn areas and surfaces have dried.

When to re-seed the treated zones?

After one day since spraying Spectracide Weed & Grass Killer, you may re-plant treated areas with ornamental herbs, plants, and shrubs. You can wait at least 7 days after application before reseeding or laying sod.

Does it produce toxic fumes? 

It does have a chemical odor, avoid sniffing it very closely.

Video Guide: How To Use Spectracide

Final thoughts 

If you have to cope with endless weeds in your large yard area, then you won’t find a more affordable and effective solution than the Spectracide Weed and Grass Killer. It acts quickly, being cost-effective and efficient at the same time.