Finalsan Weed Killer Herbicide - 4 L

Read label before using. A non-selective herbicide for consumers to control weeds, grass, algae, and moss outdoors. Weed, moss, and algae killer. For domestic use only.
A fast-acting weed, moss, and algae killer.

A fast-acting weed, moss, and algae killer.

  • Finalsan Herbicide 4 Litre Jug
    CAD $69.99


Efficiently control unsightly weeds and moss that grow in outdoor areas with Finalsan Non-Selective Herbicide.

Designed for consumer / residential use, Finalsan is a concentrated, non-selective herbicidal soap that can be used for weed and moss control outdoors. This patented, fast-acting herbicide uses a specially formulated, non-staining, ammoniated soap of fatty acids to control and suppress many common annual, biennial, and perennial weeds that grow around fruits and vegetables, ornamental flowers, garden beds, trees, shrubs, decks, patios, bricks, and cement. It is also quite effective for controlling grass, dandelion, algae, moss, and lichen that grow outdoors.

Finalsan is a concentrated liquid designed to be mixed with water. It is ideal for larger residential properties. Even though Finalsan works fast in warmer weather, it can be used in cool weather. Finalsan can control many weeds and vegetation, including annual bluegrass, chickweed, mouse-eared chickweed, corn spurry, dandelion, groundsel, lambsquarters, large crabgrass, mustards, plantain, redroot pigweed, round leaved mallow, sheep sorrel, shepherd’s-purse, stinkweed, thistle, moss, algae, and lichens.

Areas for Weed Control: where fruits, vegetables, and flowers are grown (including fields), as well as landscaped areas, lawns (for spot treatment only), parks, buildings, sidewalks, fences, bark mulch, driveways, patios, gravel, and garden beds.

Areas for Moss and Algae Control: buildings, roofs, decks, sidewalks, driveways, fences, patios, gravel.

How it works: The herbicidal soap penetrates the cuticle (protective coating) of plants, causing the plant to dehydrate and die. Free fatty acids accumulate in plant cells and cause intracellular damage, leading to cell collapse. Activity is non-selective and will kill any plant the soap comes in contact with, but will not translocate to underground portions of the plant.

Directions: Spray weeds and grasses thoroughly when weather is warm and dry. If rain falls within three hours of application, an additional application may be required. Repeat treatment every 2-3 weeks for control of new growth. For optimum results, spray weeds before they reach 12 cm (4.7") tall.


  • Size: 4 L (1.05 US gal)
  • Coverage: 40 square meters (430 square feet)
  • Concentrated liquid to be mixed with water
  • Low odor
  • Leaves no harmful residue in soil
  • Won't stain bricks, concrete, or asphalt
  • Safe for pets and people (can re-enter area once spray dries)
  • Biodegradable
Avoid direct application to ponds, streams and lakes. Do NOT contaminate irrigation or drinking water supplies or aquatic habitats by cleaning of equipment or disposal of wastes. Store at ambient temperatures, tightly capped. Protect from freezing. Absorb large spills with absorbent materials. Dispose of in accordance with local regulations.

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