Garlon 4 Ultra Herbicide


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5 out of 5 stars Rating: 5

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{ $266.95 { $264.81
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Garlon 4 Ultra Herbicide jug (2.5 gal)

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Garlon 4 Ultra Herbicide

Garlon 4 Ultra Herbicide is the industry standard for herbicide control. Made by Dow AgroSciences, this product keeps right-of-ways, roadsides and other noncrop sites clear of unwanted weeds. Using triclopyr as its active ingredient, Garlon 4 Ultra Herbicide controls 80 different plants that other methods of control would have a difficult time dealing with. Just follow one of the varied applications, from basal, cut-stump or stem treatments, to get rid of the problem plants. Garlon 4 Ultra Herbicide uses a plant-based solvent that follows all of the new environmental regulations that make other petroleum-based products unusable. It is also less toxic to non-target plants and has a milder smell than other herbicides.

Basal treatments - This treatment is best for routine maintenance, the trees are less than 6 inches in diameter, for year-round use except for wet conditions, and for low profile applications around desirable vegetation, to not affect them in any way. Spray the product on the lower 12 to 15 inches of bark around the stem and spray until the bark is wet. Do not apply when the bark is wet from rain or heavy dew. If the product turns white when applied, that is an indicator that the bark is too wet.

Dormant-stem treatments - This treatment is best during the late fall and winter after the leaves fall. The product works to control small, woody plants, while offering flexibility to adjust to different plant species. This makes for keeping work crews busy during slow work periods. The product penetrates the bark, killing the weeds. Just spray the product directly on individual plants or clumps of weeds.

Cut-stump application - An easy and efficient method, this treatment is effective for controlling tree stumps, stopping any resprouting. This works great in open, highly visible areas, keeping ugly brownout at bay. The product can be applied at any time of the year, though it is best right after the tree was felled. Do not apply when ice, snow or water prevents spraying on the ground. Spray the 2 outer inches of the wood around the entire stump, as well as the bark down to the ground level and any exposed roots.

Cut-stubble application - This application is for controlling cut brush to keep it from growing, which would need to be moved otherwise. This works at any time of the year. This application keeps the brush from growing, making a single mechanical clearing last for 8 to 10 years. It also prevents unsightly brownout and weed and brush reseeding. Dilute the product with water and spray the desired area right after clearing the area, before reseeding can occur. Do not apply when the ground is frozen, snow covered or when standing water is present.

Hack-and-squirt application - Cut the tree with a hatchet or machete to create a 3 inch deep pocket where the herbicide can be applied and is absorbed into the cambium of the tree. Only spray the cut with enough herbicide to partially fill the cut. Do not fill the cut to the point where it can spill out or apply it during heavy sap flow periods. This method is best for large trees in sensitive areas without cutting them down, though it takes longer than traditional methods.

Injection application - This application takes the herbicide and uses a tree injector to deliver it directly to the cambium and xylem. This is best for difficult to control species, though it takes longer than other methods. Just place the holes at 2 inch intervals. For maximum control, use basal or foliar applications at the same time. Do not apply to sap-flowing species during their sap excretion periods, since it will push the herbicide out of the injection points.

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  • 2 of 4 people found this review helpful:

    5 of 5 stars  Amazing
    By Jc in SW Florida on 12/03/2016

    We have a large stand of invasive Brazilian pepper on the back of our property. We recently used this with basal bark treatment as recommended by IFAS/UofFL. Used leftover tank mixture as foliar. After a month, the trees appear to be completely dead. Highly recommend, but you must read the label thoroughly (as always) and use as directed.

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11/24/2016 Joe from Sudbury, Ma

QWill Garlon 4 Ultra Herbicide eradicate buckthorn?


Yes, Garlon 4 Ultra Herbicide is labeled to treat buckhorn. The label recommends to use at 1 to 8 quarts per acre to control broadleaf weed and woody plants. It is suggested that rates higher in this rate range be used to control woody vegetation.

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02/20/2017 Keith from Milwaukee Wi

QWill Garlon 4 Ultra Herbicide kill poison sumac in a swampy area with a combination of cut and standing plants?


Garlon 4 Ultra Herbicide is labeled to control woody plants such as sumac and permitted to be used in swamp areas. Please refer to page 5 of the product label for mixing rates.

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03/12/2016 John from Shickshinny

QWill Garlon 4 Ultra Herbicide kill Russian olive?


Garlon 4 Ultra Herbicide is not labeled to control Russian Olive. Weedmaster is a comparable product we carry that is labeled for it and can be used in many of the same areas.

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