For lower volume basal stem applications of Garlon 4 Herbicide to control seedlings, you would use 20-30 gallons of Garlon 4 in enough oil to make 100 gallons of solution. This breaks down to 25-38 oz of Garlon 4 per gallon of oil solution. Per page 7 of the product label under "Low Volume Basal Bark Treatment": Spray the basal parts of brush and tree trunks to a height of 12-15 inches from the ground in a manner that thoroughly wets the lower stems, including the root collar area, but not to the point of runoff.
Garlon 4 Ultra Herbicide is labeled to treat woody plants, annual and perennial weeds on roadsides, railroads, pipelines, industrial sites, forests, grazing areas, and rights-of-way such as power lines. It is not labeled for residential use.
Garlon 4 Ultra Herbicide is not labeled specifically for use with a hack and squirt method for tree control, but typically this is an effective application using triclopyr herbicides. Keep in mind that taller trees will still need to be cut and removed safely, so you would normally cut these trees and then treat the fresh cuts with the Garlon 4 diluted at 20-30 gallons in enough oil to make 100 gallons of solution. This breaks down to 25-38 oz of Garlon 4 per gallon of oil solution.
The Garlon 4 Ultra Herbicide label does not recommend the hack and squirt method for any plants. It is best applied as a basal bark spray or as a stump treatment. If you are wishing to not cut the trees down first, you can follow the basal bark spray directions of the product label. If you wish to make hacks in the tree trunk prior to the bark spray you can do this as well. Per the label, it is best used on trunks 6 inches in diameter or less. Trunks with larger diameters should really be cut down to a stump and then applied at the recommended stump treatment rate.
Globe chamomile or stinknet is an invasive plant only found in a few areas in the US right now, so it will not be on the label for Garlon 4 or any other herbicides at this time. Several articles do recommend using a triclopyr product such as Garlon 4 to control this plant, however. You can read more about this plant in this article. We also recommend contacting your local Cooperative Extension office here for more information on what has been effective in treating this plant in your area.
While Garlon 4 Ultra Herbicide is labeled for Sweetgum, according to the manufacturer it is not recommended to use it around or under any desirable trees due to potential damage.
Garlon 4 Ultra Herbicide is not labeled to eradicate torpedograss. Unfortunately, most of the herbicides will only suppress the torpedograss for a short time, but will not kill it completely. It is recommended to spot treat the torpedo grass with a non-selective herbicide such as Round Up Quick Pro and then re-seed or re-sod in those areas.
Garlon 4 Ultra Herbicide should be applied when weeds are actively growing and temperatures are between 65 and 85 degrees.
Garlon 4 Ultra Herbicide is not labeled to control bittersweet so we are unable to provide a rate for this use. Asiatic/Oriental Bittersweet is an invasive species and difficult to eradicate and control. We recommend that you speak to the manufacturer Dow AgroSciences for information on treating with Garlon as it is not listed on the label. They can be reached at 800.992.5594.
Unfortunately, Garlon 4 Ultra Herbicide is not labeled to control smilax/greenbriar. We do not carry Garlon XRT, but it’s unlikely this would be labeled for control, either. Smilax is very difficult to control and usually requires a combination of digging and possibly mutiple herbicide applications over several years to eradicate the root system completely. The only product we have labeled for this plant is TVC Total Vegetation Killer. This product stay in the ground for up to one year, so you would only want to use it in areas where you don’t have or want any desirable plants for at least this long.
This blog post has some great accounts of treating this plant. And this guide from the UGA Extension has some great insight, too. We always recommend contacting your local Cooperative Extension for further assistance with tough weeds like this one in your area.
Garlon 4 Ultra Herbicide does not list that is controls Asiatic Jasmine. You may try reaching out to the manufacturer to confirm if it could be used for it. Dow can be reached at 800-992-5994