This has grown from seemingly nothing to a massive plant in about 2 weeks. I have been googling and I suspect Japanese knotwood? But I am not very knowledgeable about plants. From what I have read it sounds like it is going to be difficult to manage if it is knotwood.
It is located in Nova Scotia Canada and had already over a meter tall.
Confirmation and management advice would be appreciated, thanks!
by toodle-boo
12 Comments
Yes, it’s Japanese knotweed.
Yup, that’s knotweed. Pops up quickly in the spring and can get to like 10 feet tall by the time it goes dormant.
Wait until it starts going dormant (late September to early October here in Indiana), which will be right as or after it flowers, and inject each stem at its base with 2mL of glyphosate herbicide (I use a 53% concentration solution). I just use a knife to puncture the stem, twist it open, insert a 10mL plastic syringe with the herbicide, remove the knife to close the wound, inject the herbicide, remove the syringe, and repeat on the next stem. Injecting as it’s going dormant but before the first frost allows more of the herbicide to reach the roots, doing more damage to them.
Keep in mind that even with herbicide, it usually takes at least a few years to clear an established infestation, and you still have to monitor for several years after to catch any dormant seeds or roots that sprout back up.
Yes Japanese knotweed, good luck getting rid of it 🙁
It appears to be growing near a building of some sort. That adds urgency and severity to this that makes me think you shouldn’t DIY removal. It reacts to non-fatal removal attempts by sending new shoots up, these new shoots and the plant’s roots can absolutely destroy foundations. It’s adapted to grow through lava flows in its native range
https://preview.redd.it/25d9a03j1l0h1.jpeg?width=320&format=pjpg&auto=webp&s=1d4e563cab1ff850aaffcb0fd93ce01b12f801a2
Congratulations! It’s NOT poison ivy
I’m so sorry. 😭
Yup. Looks like you have Lillie’s of the Valley too. Also incredibly invasive
Get rid of it!!! Will
Take over your garden .
I had no idea this crap had an actual name until last year. I’ve been calling it “Sham-boo”
Yeah if you just bought the house whoever sold you this knew and really fcked you over
Don’t cut it!!! Let it grow over the season. You want the cane as thick as possible and you inject it with herbicide. I hate herbicide and wouldn’t use it unless necessary but this is a case I would make an exception for. Inject it at the end of summer and you’ll get 90% on the first go.