March, 2024
Knotweed Removal – How to Get Rid of This Invasive Plant
It is important to be very careful when disposing of knotweed removal as even the tiniest fragments can re-sprout. Never put this plant in a compost pile or allow it to be washed or blown away; instead, use a licensed waste carrier who can take this material for disposal at an approved landfill site. Also, be sure to thoroughly dry out any cut stems before tossing them in order to minimize the risk of rhizome sprouting. If possible, it is also best to use this method to dispose of Japanese knotweed in riparian areas as the roots can easily move downstream in waterways.
The invasive plant’s management team at Acadia National Park uses a combination of yearly cutting and herbicide treatments to control knotweed stands. We do not recommend digging up these weeds as this can damage other native vegetation and increase soil disturbance. It is a very time-consuming and costly method of removal. However, if you are looking for an immediate solution to a large infestation, excavation may be the only available option.
Combatting Knotweed: The Importance of Professional Removal Services
Chemical controls for knotweed are most effective when applied to cut stems or foliage. Glyphosate is one of the most commonly used herbicides to kill knotweed. It can be combined with other herbicides such as triclopyr or imazapyr to reduce foliar activity and improve efficacy against knotweed. In addition, glyphosate is available in aquatic-labeled formulations to be safely used in and around wetlands.
It is important to note that, despite the many control methods described above, it takes years of consistent effort for Japanese knotweed to be completely eradicated. If you are not comfortable with this level of commitment, we highly recommend calling in a professional to treat and remove this very tenacious invasive species for you.
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