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Woody stem plants, especially those that are unwanted on a landscape, can be quite difficult to control by mechanical or manual means. An effective herbicide which can deal with woody stemmed vegetation is an active ingredient called Picloram. Picloram is great on foliage and forestry areas and is regarded as one of the most popular herbicides used by forest management professionals in the United States.

Solutions Pest & Lawn has some great herbicide products which contain the active ingredient  picloram and we regularly suggest this product to our customers who want to control woody stem plants and remove broadleaf weeds. On this page we will share with you background info about picloram, it’s mode of action and benefits. You can also access this page to shop our entire line of picloram-based products.

What Is Picloram?

Picloram (Chemical name:4-Amino-3,5,6-trichloro-2-pyridinecarboxylic acid) is a systemic herbicide and functions as a plant growth regulator used to control deeply rooted herbaceous weeds and woody plants in rights-of-way, forestry, rangelands, pastures, and small grain crops. It is applied primarily on pasture and rangeland, followed by forestry areas.

Picloram was first registered as a pesticide in the U.S. in 1964. Picloram is formulated either as an acid (technical product) or as a potassium salt. The basic formulation can be applied by broadcast or spot treatment as a foliar (leaf) or soil spray. It can also be used as a basal bark spray treatment.Herbicides containing Picloram are sold under a variety of brand names. Dow Chemicals and now Dow AgroSciences sell herbicides containing it under the brand name Tordon and Pathway.

Picloram has been manufactured either alone or as mixtures with other active ingredients, including 2,4-D, fluroxypyr, triclopyr, clopyralid, or combinations of all.

How Does Picloram Work?

Picloram’s mode of action is that it poisons plants by replacing the plant growth hormone indoleacetic acid in new growth, where it accumulates. Picloram kills by inhibiting protein synthesis in the plant so that it cannot make new tissues. 

Picloram can be sprayed on foliage, injected into plants, applied to cut surfaces, or placed at the base of the plant where it will leach to the roots. Once absorbed by the foliage, stem, or roots, picloram is transported throughout the plant.

Browse our selection of picloram contained products below. For more information about picloram or other active ingredients in our herbicides, reach out to us with your questions at 800-479-6583 or email us at askapro@solutionsstores.com.

Featured Products Which Contain Picloram


Tordon 22k Herbicide (Picloram) -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

Grazon Pro Herbicide (Picloram P+D) - Grazon Pro Herbicide (Picloram P+D) by Alligare LLC is a weed killer for control of undesirable vegetation in established turf, pastures and rangelands. Grazon is the best weed killer for large fields and pastures. It is very popular as a farm herbicide and has been around for a long time and goes by other names like Graze On, Grazeon, and Grazon Extra. RESTRICTED USE PESTICIDE.


Is Picloram Safe To Use?

Picloram is a restricted herbicide which requires a license to purchase and must not be applied directly to water. Picloram’s potential to contaminate groundwater and its ability to damage non-targeted plants, limit it's use to licensed pesticide applicators. Picloram can stay active in soil for a moderately long time depending on the type of soil, soil moisture and temperature so site assessment is necessary before use.


Picloram is relatively non-toxic to humans. However, picloram is known to be irritating to human skin, and there have been numerous reports of other symptoms following human exposures, including: sore eyes and throat, itching and burning skin, skin rashes, persistent headaches, fatigue, deterioration of memory and vision, numbness.


When using products containing picloram it is imperative to wear the proper clothing, which you can find out by checking the product label. Picloram is considered "slightly toxic" if ingested, inhaled, or absorbed through the skin.  Handlers of the product are at risk for these kinds of exposures during mixing, loading, and spraying if the proper PPE (personal protective equipment) is not worn.

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