To tackle a huge patch, (make a few trails first on the inside and also blaze a trail around the perimeter), start inside the clump and spray all the stems first, then start at the back and work your way out spraying the undersides of the leaves. Next, go around the perimeter of the patch, carefully spraying all the leaves around the outer edge. Lastly, open your nozzle to full stream and spray over the top of the patch from all sides. Take heart, next year the knotweed will be stunted and easier to spray. 1)The ultimate date for spraying Knotweed is on or around September 15, after the bees are done pollinating. 2) Use 2 ounces Glyphosate and one ounce of a sticker per gallon. 3) Tighten your nozzle to just more than a mist (depending on distance away from the plant) and cover every inch of each plant, first the stem, then leaves and undersides of leaves too if at all possible. 4) The silver bullet to eradicating knotweed is this... when you are done thoroughly spraying... wait for the herbicide to be totally absorbed/dry and spray it all over again one more time! (2nd spray could be done the next day.) After only having 10 percent eradication of the knotweed clumps I treated year after year (for 10 years)... I finally used the double spray in one day technique and found 90% eradication the following season.

If there is knotweed on the neighboring property, it’ll soon be on your property. You have to get it all.

you should apply the glyphosate only in the fall, when the sap stream reverses, so that it's taken into the rhizomes

I absolutely love your enthusiasm Mike. Your clearly not a man that gives up easy ✊️ Greetings From Ireland ☘️

Spraying Should only take place after the plant has flowerd because the sap returns to the rhizome taking the poison with it the professionals use tordon

So what was the final outcome? I'm in the "control" phase. I really don't know if the crowns are in hibernation or really killed, but it's late spring and i only see small stems. I'm year 3 into my treatment.

We moved onto five overgrown acres in 2018. 2 acres is CHOKED OUT with japanese knotweed!! This year I'll get rid of it or go broke trying 🤣

fantastic video thank you really helpful however I do have a question I have purchased a Roundup proVantag 480g also I am planning to inject it into the Japanese knotweed with the needle my question is how to mix it? would it work better if I use less water? obviously, it is going to be stronger or does it have to be mixed a certain way?

I need to attempt mines this year. Should I cut back and spray. Or initially just spray them?

Any update on this how does it look now? Can you do follow up vid plzz

Can I cut it to a certain height, burn the stems then spray the rest of it instead ?

I have tons of Japanese knotweed on my property, any product with glyphosate seems to be the only chemical that kills them off with good visible results. I make sure to spray every week and now even the amount of new growth is little to none. Glyphosate has helped reclaim so much of my property back

How’s it looking a year later?

Hey. Hows it looking now Mike? Im thinking of buying a property with Japanese knotweed and wondering how yours is looking after 9 months. Cheers

If the neighbours do not do the same then it will always come back.

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