Hi-Yield Triclopyr Ester is not labeled to treat johnsongrass. It targets broadleaf weeds. Gordons Ornamec Over-The-Top Grass Herbicide will kill johnsongrass around established listed ornamentals. Ornamec will control Annual Johnsongrass seedlings (sorghum halepense) when 2 to 8 inches tall, before tillering or heading. It will control perennial rhizome johnsongrass that is 8 to 18 inches tall and before booted stage, per the product label. You may need multiple applications for more mature plants. We also suggest using a pre-emergent herbicide in the future for the best control of Jonhsongrass and many other difficult weeds. Prodiamine 65 WDG is safe to use around most turf and ornamentals. If treating the grass in the lawn, please provide the desired turf species for a recommendation.
Answer last updated on: 07/18/2018