Hello,

Thanks for reaching out to the UNH Extension Infoline.

When dealing with very aggressive and invasive plants we often recommend using systemic herbicides like glyphosate or triclopyr, which when used properly, is very effective. For these, you can cut the plants down and apply a small amount to the cut stump. The herbicide will travel to the root system and kill the plant.

Here's a landing page from the UNH Extension website specifically on control methods of invasive plants but it also applies to aggressive, non-invasive plants. Here's a link.

I hope this helps and please ask if you have further questions!