Managing Japanese Knotweed When the Season Is Nearly Over
Japanese knotweed is one of the most stubborn invasive plants, and effective management usually requires multiple treatments starting early in the growing season and continuing through summer. But what if it’s already too late and you’ve missed the chance for those early applications?
Why September Still Matters
Even if only one treatment opportunity remains, September is an ideal time to act. After flowering, knotweed naturally shifts its energy and nutrients back into its root system in preparation for winter. Applying herbicide during this phase allows the product to move deeper into the plant’s roots, making a single late-season treatment especially powerful.
The Risk of Waiting Until Spring
Delaying control until next year allows knotweed to return with even more aggressive growth in the spring. A September application doesn’t just suppress growth now, it also weakens the plant’s reserves, setting you up for much better results next season.
After Treatment: Clean-Up & Site Care
Following treatment, knotweed stems will die back as the weather cools. To keep your property tidy, we can return in October-November to cut and remove the dead canes. Knotweed cannot spread from dead stems, so this is a personal preference if you like to keep your yard tidy!
Act Before It’s Too Late
Missing multiple applications doesn’t mean knotweed control is off the table. A September treatment can make a significant difference in curbing regrowth and keeping your property manageable next year. Contact Western Weed Control today to book your late-season service and stay ahead of this invasive plant.
