Killzall vs Roundup: Which is Better?

Both Killzall and Roundup use the same herbicide as the active ingredient—Glyphosate. This makes them nearly identical weed killers. They both act as non-selective herbicides that kill all weeds, grasses, and other plants. Fundamentally, there is almost no difference between the two products.

You can use Killzall and Roundup for the same purpose because they have the same herbicidal ingredient. Either one will work as an all-purpose weed and grass killer.

Killzall vs Roundup

Is Killzall the Same as Roundup?

Killzall and Roundup are so similar they can be used interchangeably. Because both have the same active ingredient—Glyphosate—they have the same weed-killing strength and capability. Think of Roundup as the name brand for Glyphosate weed killers, while Killzall weed killer is the less flashy store brand. To illustrate this comparison, let’s look at these two products:

Essentially, what you are paying for in these two products is the weed killer (Glyphosate) and the surfactants that help the weed killer cling to plant leaves. Both Killzall concentrate and Roundup concentrate products, when diluted according to product label instructions, will be at similar potency and have the same effect when coming in contact with weeds.

In most cases, Killzall is much cheaper than Roundup because it is a generic brand. You can save a lot of money and get the same weed control results by going with Killzall.

Glyphosate-Based Weed Killer
Hi-Yield Killzall | Weed and Grass Killer
  • Works quickly to kill weeds.
  • Contains Glyphosate.
  • Clear large patches of weeds and invasive grasses.
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Why is Killzall so Similar to Roundup?

Glyphosate was invented and patented by Monsanto in 1974. Until 2000, Glyphosate weed and grass killers were only available in Roundup products. However, once the Monsanto patent on Glyphosate expired in 2000, other companies were allowed to manufacture and sell Glyphosate herbicide. These companies didn’t invest money to test and develop Glyphosate, so they can sell the same product at a much lower price than Roundup.

  • Monsanto owned the Glyphosate patent from 1974–2000. During this time, Roundup was the only Glyphosate weed killer on the market.
  • Since the expiration of the patent in 2000, other herbicide manufacturers have been legally allowed to sell Glyphosate products.
  • Today, many weed killers from different manufacturers include Glyphosate.
  • Killzall is a Glyphosate product designed to copy the formulation and efficiency of Roundup.

Killzall weed control was designed and patterned off of Roundup, to act as a direct competitor. This is why its active ingredients, formula, and results are the same as those found in Roundup weed killer.

What’s the Difference Between Killzall and Roundup?

The key difference is that Killzall and Roundup are combined with different surfactants. Surfactants are the ingredients in a weed spray that cause the herbicide to cling to plant leaves. In the battle between Killzall and Roundup, this is one of the only differences. It mostly affects the time until the weed killer is rainproof.

  • The main difference between Roundup and Killzall is the surfactant formulation, which affects how long it takes for the herbicide to resist rain and watering without dilution.
  • Roundup is rainfast in 30 minutes.
  • Killzall is rainfast in 2 hours.

If you expect rain in the immediate future, Roundup weed killer is a better choice. But besides this small difference, there is very little that differentiates the two products. They are about as similar as a name-brand pain reliever and the store-brand ibuprofen sitting beside it on a drug store shelf.

Quickly Rainproof with Fast Results
Roundup | Weed & Grass Killer Super Concentrate
  • Easy application and rainproof within 30 minutes.
  • Noticeable results with weeds wilting and dying within 2-4 days.
  • Kills a large variety of unwanted and invasive weeds and grasses.
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Can You Use Killzall Instead of Roundup?

Killzall can be used as a Roundup weed killer replacement in all applications because the two products have the same exact active ingredient. This makes Killzall weed killer just as useful for clearing overgrown patches of grass and weeds, killing weeds growing through concrete seams, and spot-treating unwanted plants in your yard and garden.

  • You can use Killzall instead of Roundup in any application where you would typically spray Roundup.
  • The Glyphosate in Roundup is the same you find in a Killzall weed control product.
  • Killzall and Roundup are both non-selective post-emergence herbicides. They will attack all weeds, grasses, and other plants.
  • Both products require 7–14 days to fully kill plants.
  • Keep in mind, both Killzall and Roundup are harmful to all plants and grasses, including the desirable grass in your lawn.

As long as you’re prepared to mix concentrated Killzall with a few gallons of water to achieve the correct dilution rate, you can save a lot of money by purchasing Killzall instead of Roundup. It’s a smart choice that’s just as effective as the name-brand product.

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