Herbicides to control buckthorn

Trade NameChemical NameConcentrationUse
Ortho Brush-B-GonTriclopyr amineReady to use - do not diluteCut stump
Ferti-Lome Brush Killer and Stump KillerTriclopyr amineReady to use - do not diluteCut stump
Garlon 3A, VastlanTriclopyr amineMix one part Garlon 3A with 3 parts water
(this achieves a 25% solution), for Vastlan consult label
Cut stump
Garlon 4 Ultra, Element 4Triclopyr esterMix one part Garlon 4 with 3 parts bark oil/diluent
(this achieves a 25% solution)
Cut stump or basal bark
Pathfinder IITriclopyr esterReady to use - do not diluteCut stump or basal bark
Roundup, Rodeo, Accord, Etc.Glyphosate
  • Cut stump: Look for at least 25% active ingredient glyphosate for cut-stump treatments. If using Roundup Concentrate you can mix 1 part water with 1 part herbicide to achieve a 50% solution. 
  • Foliar spray: Lower concentrations (2% active ingredient) work for foliar spray of seedlings.  If using Roundup Concentrate you can mix a 1:50 to 1:20 herbicide:water ratio.
Cut stump or foliar spray