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Tordon 22k Herbicide (Picloram)

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Tordon 22K Herbicide from Alligare is a picloram based weed killer that is used especially to kill Japanese knot weed, to spray brush, and to control prickly pear cactus in range and pasture lands. Tordon 22K can also be used to kill trees and other brush. This herbicide requires a applicator permit license to purchase. Not for Sale to Rhode Island

Target Pests

Tordon 22K Herbicide is for the control of annual and perennial broadleaf weeds woody plants and vines such as bindweed cocklebur daisy dock goldenrod groundsel horseweed knapweed lambsquarters larkspur mayweed milkweed pigweed ragweed ragwort smartweed sowthistle spurge sunflower thistle yankeeweed aspen cedars douglas fir dogwood hickory maple persimmon live oak poison oak sagebrush sassafrass sumac willows and many other listed weeds.

For Use In

Picloram 22K Herbicide is for use in rangelands permanent grass pastures forest planting sites fallow cropland spring seeded wheat industrial manufacturing sites rights-of-way pipelines roadsides railroads wildlife openings and on conservation reserve program lands.


Hand-Held Sprayers: Hand-held or backpack sprayers may be used for spot applications of Alligare Picloram 22K if care is taken to apply the spray uniformly and at a rate equivalent to a broadcast application. Application rates in the table are based on an area of 1,000 sq. ft.

Mix the amount of Alligare Picloram 22K (fl. oz. or ml) corresponding to the desired broadcast rate in 0.5 to 2.5 gallons of water, depending on the spray volume required to treat 1,000 sq. ft.

To calculate the amount of Alligare Picloram 22K required for larger areas, multiply the table value (fl. oz. or ml) by the area to be treated in “thousands” of square feet, e.g., if the area to be treated is 3,500 sq. ft., multiply the table value of 3.5 (calc. 3,500/1,000 = 3.5). An area of 1,000 sq. ft. is approximately 10.5 x 10.5 yards (strides) in size.

Coverage Area

Each Gallon of picloram will treat up to 4 acres of land.

Time to Kill

Picloram 22K Herbicide begins to kill target weeds 2 weeks after contact but can take up to several weeks for complete control all depending on treatment area and application.

Mix Rate

Maximum Use Rates:

Non-cropland Areas and Rights-of-Way: Total use of picloram, including retreatments or spot treatments, must not exceed 1 lb ae per acre picloram (2 quarts per acre Alligare Picloram 22K) per annual growing season.

Forest Sites: No more than 1 lb. ae picloram (2 quarts of Alligare Picloram 22K) per acre may be applied one time every two years to forest sites.

Rangeland and Permanent Grass Pastures: For control of noxious weeds as defined by federal, state, or local authorities, picloram may be applied at up to 1 lb ae per acre (2 quarts Alligare Picloram 22K per acre) per annual growing season as a broadcast treatment.

Spot treatments may be applied at the equivalent broadcast rate of up to 1 lb ae picloram (2 quarts Alligare Picloram 22K) per acre.

Active Ingredient

Picloram 24.4%

Tordon 22k Herbicide (Picloram)

Where to Buy Tordon 22k?

Tordon22K herbicide provides all-purpose noxious weed control and basic invasive weed management. Solutions Pest & Lawn is the place where you can buy Tordon 22k and take care of those pesky weeds once and for all.

Product Q & A

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Browse 11 questions Browse 11 questions and 13 answers
What do you have that is non-restricted use to kill cacti. I have a lot of cactus around my ranch.
Matt on Mar 16, 2017
BEST ANSWER: If you are looking for something non-restricted to kill cacti we have many people who get good results with Triclopyr mixed with Diesel Fuel. Mix 3oz per gallon of fuel and right before spraying see if you can somehow damage the plant either by hitting it with a machete or running it over with a tractor. That will speed up the uptake of the herbicide to ensure root kill. Hope this helps. If you have any questions let me know.
Is Tordon 22K safe to use on pastures for lactating beef cattle?
Richard K on Dec 6, 2017
BEST ANSWER: Grazing Restrictions: Do not cut grass for feed within two weeks after treatment when
applying more than 1 quart of Alligare Picloram 22K per acre. Meat animals grazing for up
to two weeks after treatment should be removed from treated areas three days prior to
slaughter. Do not graze lactating dairy animals on treated areas within two weeks after treatment.

Allow 7 days of grazing on an untreated grass pasture (or feeding of untreated hay) before
transferring livestock from treated grazing areas (or feeding of treated hay) onto sensitive
broadleaf crop areas. Otherwise, urine and manure may contain enough picloram to cause
injury to sensitive broadleaf plants.
• Do not use manure from animals grazing treated areas or feeding on treated hay on land
used for growing broadleaf crops, ornamentals, orchards or other susceptible, desirable
plants. Manure may contain enough picloram to cause injury to susceptible plants.
Will Picloram have an effect on kudzu ?
Frank on Jul 23, 2017
BEST ANSWER: No, it would be better to use Crossbow to control Kudzu,

What can kill knotweed that does not require a license?
A shopper on Jun 13, 2018
BEST ANSWER: You can use Glyphosate to kill the knotweed, Here is an information guide that I found on methods to control the invasive weed.


There is also Tordon RTU that is same active does not require license, so if you have only a small area to control this might be an option.


Is this product aquatic safe to use around streams?
Garlan M on Jun 10, 2018
BEST ANSWER: No, Tordon 22K is not labeled for use around aquatic areas. You would need to take care of make sure there is not any chance of run off.

This is a restricted use product and would require a license.

Is there something in particular you were trying to control?
What's the mix rate for Tordon 22K for a spot sprayer/back pack sprayer , for knapweed and toadflax in steep hills?
A shopper on May 15, 2018
BEST ANSWER: 1-2 pts. Alligare Picloram 22K per acre

Apply during active growth prior to bud stage. Lower rates in rate range may require annual spot treatments.
Control with lower rates may be improved by tank mixing with 1.0 lb. a.e. per acre 2,4-D.
Goldenrod: Apply during active growth prior to bud stage.
Diffuse or spotted knapweed: Optimum application from rosette to mid-bolting stage or to fall regrowth.
Under favorable growing conditions, application in summer can be effective if higher application volumes are
Thistle (Canada and Wavy Leaf): Apply when most basal leaves have emerged, but before bud stage, or
apply to regrowth in the fall. Apply rates less than 1 1/2 pts./acre only under favorable conditions and in combination
with 1 lb. a.e./acre of 2,4-D; retreatment may be required.
Absinth wormwood: Apply in spring or early summer when plants are actively growing.
Ox-eye Daisy: Use 1 ½ - 2 pts./acre with at least 30 gallons per acre of water.
Will tordon 22 k mix with diesel fuel as a carrier for cut stump treatment be better than water?
A shopper on Apr 18, 2018
BEST ANSWER: Mixing Oil-Water Emulsions (Ground and Aerial Applications)
For aerial application, add oil to the total spray mix at the ratio of 1 part oil to 5 parts water
(1:5 ratio). For ground application, add oil to the spray mix at a rate of 5 to 10% of the total
mix. Do not use more than 1 gallon of oil per acre for aerial or ground application. Use agricultural
spray emulsifiers such as Sponto 712 or Triton X-100 according to mixing
instructions given below.

You can mix with oil, please follow label application recommendations.
what is the mix rate for cut stump application?
A shopper on Jan 10, 2018
BEST ANSWER: 4%. 5 oz per gallon of mix along with 1/4% of surfactant (1/3 oz per gallon). Source: http://texnat.tamu.edu/about/brush-busters/cut-stumps/cut-stump-spray-for-redberry-cedar
Will this kill Buckhorn Plantain?
Ray H on Aug 24, 2017
BEST ANSWER: It is not listed specifically on the label, but will kill most everything. For control of other broadleaf weeds and woody plants, picloram may be applied broadcast
at up to 0.5 lb ae per acre (1 quart Alligare Picloram 22K per acre) per annual growing season.
Apply spot treatments at an equivalent broadcast rate of up to 1 lb ae per acre (2 quarts
Alligare Picloram 22K per acre) per annual growing season, but not more than 50% of an
acre may be treated. Repeat treatments may be applied as necessary, but total use must
not exceed the maximum amount specified.
How long can I expect the residual of Picloram 22k to remain in the silt loam soil in the 30'x60' low spot? Average rainfall is 15" and there is no irrigation.
A - 0 to 4 inches: silt loam
Bk - 4 to 19 inches: clay loam
Cr - 19 to 60 inches: bedrock
Tyler on Jul 19, 2017
BEST ANSWER: Picloram 22K does not breakdown very quickly as other herbicides and is considered to half a half life of 1 to 2 years. Should not consider planting in areas that are treated with Picloram for at least 1 year.
Will Picloram kill Russian or Spotted Knapweed?
Thank you
Basco on Jul 5, 2017
BEST ANSWER: Yes, Picloram is labeled to kill Russian or Spotted Knapweed. This is a Restricted use product and would require a license,

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