Shawnacie from Drummond Montana writes
I have unwanted Japanese Knotweed in my yard that I need to completely eliminate for good before it completely damages the foundation and my home.
Crossbow Specialty Herbicide - 2, 4-D & Triclopyr is not labeled for japanese knotwood however using this product in combination with Roundup QuickPRO in a tank mix has shown to have good results in controlling this weed. Japanese Knotweed is definitely a very hardy weed and is tough to control, even with the best products. But this combo should help.
You may consider contacting the Master Gardener with your County Extension Office for recommendations they have shown to be successful in eliminating Japanese Knotweed.
Answer last updated on: 06/03/2022
