Wilson® WEED OUT®
Lawn Weed Killer


Former name: Wilson Lawn Weed Out Ultra Ready-to-use (1L)

Don’t you love your lawn? And don’t you hate it when noxious weeds rear their ugly heads. If you think hand weeding just takes too long then this ready-to-use spray is just for you. You can rid your lawn of broadleaf weeds, with visible results in as little as 24 hours. The spray works efficiently with long-lasting effects, killing weeds such as dandelions, plantains and ragweed right down to the roots -- with no regrowth. Best of all, it’s based on a natural plant hormone.

Other application types available

Benefits and characteristics

Rid your lawn of broadleaf weeds

Rid your lawn of broadleaf weeds

No more hand weeding: spray the weeds

No more hand weeding: spray the weeds

Where to use

  • Indoors

  • Outdoors

  • Lawn

  • Flower gardens

  • Edible gardens

  • Patios, sidewalks and driveways

  • Building foundations

Effective against

How to use Wilson WEED OUT Lawn Weed Killer

Step 1
Shake well before using.

Step 2
Aim toward target weeds and away from people and pets.

Step 3
Press the trigger to spray. Wet the foliage using short bursts of spray.

Step 4
Release the trigger to stop spray.

For more resistant weeds, re-apply after 4 to 6 weeks.



  • Use this product only when weeds are actively growing, because it is not intended to prevent new weed growth.
  • This product can be directly applied to small patches and individual broadleaf weeds as a spot treatment.
  • To maximize effectiveness, this herbicide should be used in conjunction with a sound turf management program.


  • Do not apply to drought-stressed areas or newly seeded lawns.
  • Do not apply in very hot weather (over 30 ᵒC or 86 ᵒF) or rainy weather, or if rainfall is forecast within the next 2 to 4 hours.
  • Do not water for 2 hours after application.
  • Do not mow lawn until the effect of weed treatment is visible.
  • Grass that is accidentally treated may temporarily turn brown but will recover.

Do not reuse the empty containers for other use than WEED OUT application. You can only reuse the container to refill it with Wilson WEED OUT Lawn Weed Killer Refill. Dispose empty container of in household garbage. Unused or partially used products should be disposed of at provincially or municipally designated hazardous waste disposal sites.

To prevent contamination, store this product away from food or feed. Keep from freezing.

For additional product information or in case of emergency, spills or fire, call toll-free 1-800-268-2608.


General precautions

  • Avoid activities that could result in skin contact with treated lawns or surfaces until product has dried.
  • Do not apply to desirable plants.
  • Do not apply when winds are gusty.


Hazards to humans

Can cause irritation to eyes. Can be harmful if ingested.


If in eyes

Hold eye open and rinse slowly and gently with water for 15-20 minutes. Remove contact lenses if present after the first 5 minutes, then continue rinsing eye.


If swallowed

Have person sip a glass of water if able to swallow. Do not induce vomiting unless told to by a poison control centre or doctor. Take container, label or product name and P.C.P. Registration Number with you when seeking medical attention.


If inhaled

Move person to fresh air. If person is not breathing, call 911 or an ambulance, then give artificial respiration, preferably mouth-to mouth, if possible.


In every case, call a poison control centre or doctor for treatment advice.


Download safety data sheet link.

4-chloroindole-3-acetic acid, present as potassium salt 4.5 g/L

Frequently asked questions

The active ingredient 4-chloroindole-3-acetic acid is based on a natural plant hormone found in peas and broad bean plants. WEED OUT is a selective herbicide. When sprayed on broadleaf weeds, it triggers the plant to wilt and die.

When used as directed, WEED OUT is safe for people and pets. When spray has dried, people and pets can enter area.

Do not water the lawn within 4 hours of application or when rain is expected. Once WEED OUT is applied to a weed, it will take up to 4 weeks for the weed to completely die. WEED OUT will not affect or kill weed seeds that have not germinated yet. If a weed seed germinates after WEED OUT is applied, an application to this new weed will need to be made.

Visible effects on the weeds (wilting) can be observed within 24 hours of spraying. Weeds will then die over a 4-week period.

WEED OUT is effective, giving excellent control of dandelion and plantain and top growth control of fall hawkbit, hawkweed, cinquefoil and black medic in turf, among others.

Recently, concerns have been raised about 2,4-D. WEED OUT Lawn Weed Killer doesn’t contain this active ingredient. The active ingredient used in WEED OUT Lawn Weed Killer is based on a natural plant hormone found in peas and broad bean plants. WEED OUT Lawn Weed Killer is considered safe and legal for sale in all provinces except for Manitoba.
The WEED OUT Concentrate is banned in Manitoba, New Brunswick and Prince Edward Island because some provinces don’t allow the use of concentrate products on lawns.

No. WEED OUT will have no effect on grass or lawns. Because it is a selective herbicide, it only affects weeds that are listed on the label.Grass that is accidentally treated may temporarily turn brown but will recover.

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