Herbicides are transparent making it difficult to tell which freshly cut stumps have been treated, especially when cutting multiple stumps or stems at a time. The visibility of Mark-It Blue will greatly help you see which stumps have been chemically treated and which have been missed. Use Mark-It Blue to avoid missed treatment of buckthorn stumps that will result in a multitude of buckthorn resprouts.
Add approximately 1/2 to 1 tsp. of Mark-It Blue to your Buckthorn Blaster before adding herbicide. If approved by your herbicide manufacturer, you may add Mark-It Blue directly to your herbicide container. Be safe and always read and follow all herbicide manufacturers’ label directions.
Herbicide is applied to the cambium area of freshly cut buckthorn stumps. As shown in the photo example at left, the concentrated blue colorant in Mark-It Blue will help you highlight treated areas to avoid missed stumps and excess herbicide use.
FAQ: Will food coloring work as a stump colorant?
Answer: Not in our opinion. The quantity of food coloring required to perform as adequately as Mark-It Blue would dilute and weaken your herbicide. 2 ounces of Mark-It Blue is adequate for one to two gallons of herbicide.