Slasher Organic Weedkiller

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Slasher Weedkiller is a Registered Organic herbicide that is glyphosate-free and rapidly kills weeds, moss, algae and lichen.  Use it in gardens, paths, drive-ways, around buildings and as a spot spray in lawns. It works quickly to easily control weeds the organic way!

Slasher Weedkiller is a non-selective contact weedkiller.  Thorough coverage is needed when spraying because any parts you miss won’t be killed.  Take care when spraying around your favourite plants as any spray drift will also damage them.  Do not apply to wet weeds or if rain is imminent as the extra moisture will dilute the spray and weaken its impact.

Keep pets off treated areas while the spray is wet. Once dried pets can return to the area.


  • Kills weeds, moss, algae and lichen on contact
  • Rapid action, desiccating plants within hours
  • Doesn’t require heat or sunlight to work
  • Can be used anywhere in the garden and around the house
  • Active ingredient made from plant oils (GM free)
  • No lasting spray residues (100% biodegradable within a few days)
  • Does not contain glyphosate
  • Registered Organic for use in organic farms and gardens
  • Available in commercial sizes (visit our commercial website here)

Slasher before and after images

NOTE: Do not spray on porous surfaces without spot testing first. Slasher Weedkiller may cause discolouration on porous hard surfaces like pavers and bricks.

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Active Constituents: 525g/L Nonanoic Acid

Nonanoic acid is also known as pelargonic acid and is derived from plant oils.

Click below to download the Safety Data Sheet (formerly MSDS):

Slasher Organic Weedkiller concentrate SDS
Slasher Organic Weedkiller Ready To Use SDS


The dilution rate for the concentrate is 70ml per litre of water and can be found on the back of the bottle. Simply peel off the top layer to reveal a second layer underneath which contains the dilution rate and instructions. Peel from the top right hand corner where it says “Peel Here”.

If you can’t see a second layer underneath it means you’ve accidently peeled back both layers instead of just the top layer.

If you have trouble separating the layers there’s a copy of the second label layer shown below. Alternatively you can download the entire product label from the Product Brochure & Label tab above.

Peel back the top layer for full instructions and dilution rate

Slasher Organic Weedkiller directions

Keep pets off treated areas while the spray is wet. Once dried pets can return to the area.