Slasher Weedkiller Concentrate: Organic and Glyphosate-Free Weed Control

Slasher Weedkiller Concentrate is a Registered Organic herbicide designed to quickly and effectively eliminate weeds, moss, algae, and lichen without the use of harmful chemicals. This non-selective contact weedkiller is suitable for use in gardens, paths, driveways, around buildings, and as a spot spray in lawns, ensuring fast and efficient control of unwanted growths while maintaining an eco-friendly approach to gardening.

Features and Benefits

  • Kills weeds, moss, algae, and lichen on contact: Rapidly eliminates unwanted growths without the need for harsh chemicals.
  • Rapid action results: Desiccates plants within hours, offering fast and efficient weed control.
  • Doesn't require heat or sunlight to work: Effective all year round, regardless of weather conditions.
  • Wide range of applications: Suitable for use in gardens, paths, driveways, and around buildings.
  • Active ingredient made from plant oils (GM free): Ensures an eco-friendly and sustainable approach to weed control.
  • No lasting spray residues: 100% biodegradable within a few days, leaving no harmful traces behind.
  • Does not contain glyphosate: Safe for use in organic farms and gardens, and registered for organic use.

How to Use

  1. Dilute Slasher Weedkiller Concentrate at a rate of 70ml per litre of water, as mentioned on the product label.
  2. Apply the diluted solution evenly to the target area, ensuring thorough coverage of all unwanted plants or growths.
  3. Avoid spraying on wet weeds, or if rain is imminent, as moisture can dilute the solution and weaken its efficacy.
  4. Exercise caution when treating areas around desirable plants, as the solution may also cause damage to non-target plants.
  5. Keep pets off treated areas until the spray has dried completely.

Aqua Gardening Suggests These are Best For

Slasher Weedkiller Concentrate is perfect for homeowners and gardeners seeking an environmentally friendly and Organic Registered solution to weed control. It is especially suited for use in organic farms and gardens, as well as for those looking to eliminate weeds, moss, algae, and lichen without resorting to harsh chemicals or glyphosate-based products.

Notes from Aqua Gardening

  • Do not spray on porous surfaces without spot testing first, as Slasher Weedkiller may cause discolouration on porous hard surfaces like pavers and bricks.
  • Keep pets off treated areas while the spray is wet. Once dried, pets can return to the area.


How does Slasher Weedkiller work?

Slasher Weedkiller works by killing weeds, moss, algae, and lichen on contact. It rapidly desiccates plants within hours, making it a fast and efficient solution for controlling unwanted growth in your garden.

Is Slasher Weedkiller safe for use in organic gardens?

Yes, Slasher Weedkiller is a Registered Organic herbicide, making it suitable for use in organic farms and gardens.

Can I use Slasher Weedkiller on my lawn?

Slasher Weedkiller can be used as a spot spray in lawns. However, be cautious when using it around your favorite plants, as any spray drift can also damage them.

What is the active ingredient in Slasher Weedkiller?

The active ingredient in Slasher Weedkiller is 525g/L Nonanoic Acid, also known as pelargonic acid, which is derived from plant oils.

How do I dilute the Slasher Weedkiller concentrate?

Dilute the concentrate at a rate of 70ml per litre of water. Peel off the top layer of the label on the back of the bottle to reveal the dilution rate and instructions.

Is Slasher Weedkiller harmful to pets?

Keep pets away from treated areas while the spray is wet. Once the spray has dried, pets can safely return to the area.

Will Slasher Weedkiller work in any weather conditions?

Slasher Weedkiller does not require heat or sunlight to work effectively. However, avoid applying it to wet weeds or if rain is imminent, as this will dilute the spray and weaken its impact.

Can I use Slasher Weedkiller on porous surfaces like bricks or pavers?

It is recommended to spot test Slasher Weedkiller on porous surfaces before full application, as it may cause discolouration on such surfaces.

Still Unsure if This Product is Right for You?

  • Submit a question via the Reviews & Questions tab on this page, and our team will respond to you
  • Login to check your Aqua Gardening Member Price
  • Book a free Consult with the Aqua Gardening team here
  • Still Overwhelmed? Start your Gardening Journey with a free eBook here

(SKU: 55764)

Shipping Calculator

Enter the quantity of product and your Australian suburb name to calculate the shipping costs for multiples of this item only. You can calculate the shipping costs for your entire order, including international orders, on the Cart Page.

Free Shipping Eligibility

Aqua Gardening offers free shipping on most orders above $249 that are not bulky items.  Once you place all the items you wish to buy in the cart, the combined shipping price will be shown in the cart, including Free Shipping if you are eligible. For full details please see our free shipping eligibility here.

Delivery Information

Back Order products

These are products we usually carry in stock but are temporary out of stock. These products will be back in stock within a few days. We can send you an email notification when they are back in stock if you click on the “Notify me when back in stock” link. See the full details here.

Click & Collect Only products

These products can only be collected from our Brisbane showroom as we can not ship them. If you place any of these products in your cart, you will only see the Click & Collect option at the checkout.

Fast Dispatch products

These are products that we have in stock in our Brisbane showroom, and they are available for immediate Click & Collect or Shipping. Keep in mind that if you have a product which is not listed as a Fast Dispatch product in your cart, there might be a delay on your order. See the full details here.

Special Order products

Special Order products are products that we do not regularly stock. These products will be ordered specially for you, or dispatched directly to you from our supplier. See the full details here.

Ship-To-Store products

Products marked with ship-to-store can still be shipped to us to collect in-store! Simply check out with the shipping address: 3/4 Billabong Street, Stafford, QLD, 4053. Once your order arrives, we’ll email you to let you know that it is ready to collect.


Limited Warranty - This product has been stored in a controlled environment to ensure you will receive the best quality product possible. Due to this reason this product is sold on a strict no refund or return policy, unless it falls under a warranty claim.


60 Day Returns - Not available for this product, please contact us if you have any issues. More details...