9 Common Mistakes To Avoid in Trying to Control Invasive Knotweed

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This video describes nine common mistakes people make in trying to control invasive knotweeds like Japanese knotweed (Polygonum cuspidatum or Fallopia japonica).
00:13 - Mistake No. 1: Trying to kill knotweed by repeatedly cutting or mowing it
01:00 - Mistake No. 2: Trying to kill knotweed by covering it with just tarps or landscape fabric
01:58 - Mistake No. 3: Doing an herbicide treatment too early in the growing season
04:42 - Mistake No. 4: Doing only one herbicide application
05:50 - Mistake No. 5: Cutting knotweed in summer before a fall herbicide treatment
06:40 - Mistake No. 6: Lack of persistence in staying after the knotweed.
09:30 - Mistake No. 7: Waiting too long to plant native plants to compete with the knotweed
10:38 - Mistake No. 8: Not knocking down dead knotweed stems the season before treatment
11:25 - Mistake No. 9: Not doing anything!

Пікірлер: 173

@vKarl71

1. Don't mow it - it will only help the spread! 2. Covering it with a tarp doesn't work without extensive other layering strategies 3. Dont use herbicide early in the season - wait til fall (so the weed draws the herbicide down into the rhizome) and be sure to do it before a frost & 4. treat with herbicide twice. 5. Cutting in the summer only helps spread it !! 6. The year after first chemical treatment 7. Plant native plants 8. Knock down all dead stems the season before fall chemical treatment. 9. Worst mistake is to do nothing.

@MaxineStuart-ss1kc

I love you. I’ve made many of these mistakes in my years-long battle with knotweed along my house, but I’m not giving up yet! The challenge now will be letting it grow until fall when I hate its guts so bad.

@abdullahshaik4784 Жыл бұрын

I left a invasive plant sit on concrete block for 3 years and it never died after that I burned it in barrels. Some species are highly highly invasive

@58DELLA Жыл бұрын

Great video, I had a large stand of knotweed, sprayed it twice every year starting late summer/early fall (with 4oz of 41% glysophate mixed with 1 gallon of water). Killed 80% the first year, most of the rest the second year. this spring I found three little plants, they will be sprayed in the fall. Green shoots is correct, follow his advice. P.S. Don't mow it, don't cut it, you'll spread it all over the yard!. Kill it first.

@wishywashy1153

Knotweed sucks... but in my opinion, mugwort is worse. It stinks and isn't fun to break in half like the knotweed.

@GJ5570

I got rid of all my knotweed, dug it up, and burnt it all up. It still came back, but just a few shots, just kept poisoning it. After 3 years, it was finally gone.

@AttommicDog

When I built my house a contractor had some loam delivered and it was full of knotweed roots and chunks. Took years of spraying, and digging to get rid of it all. Nightmare. Worst weed ever.

@afriendlyhorse Жыл бұрын

Excellent video and explanations. Confirms research that I've seen in gardening groups about the best way to tackle knotweed. Since it's a plant that evolved in volcanic conditions, its ability to recover when almost completely destroyed is quite impressive. I wish states had better official procedures, I've felt physical pain the times I've watched a mower mowing the edge of highways contaminated by knotweed, knowing that it's only going to spread... Same thing with people covering, the underground network of the plant is much larger than you'd expect and it will spend all of it's energy till it finds the edge of the covering, and then it will pop up and continue happily.

@AlsanPine

or just allow the deer in. my deer here in n. idaho eat them and keep them from getting out of hand.

@sethmoking Жыл бұрын

There's a new invention called Rootwave in Europe, but unfortunately, it could be many years before it's available in the U.S.

@Storin_of_Kel

I actually work for a company in the Netherlands that combats these invasive plants. We do this with several methods such as using electricity, up to 5000 volts, hot water injection, hot water spraying.

@wikipediaboo Жыл бұрын

Thank you for this concise and well researched video! I discovered we had a small batch of knotweed by the side of our house and went into an internet rabbit hole of doom. This video made it clear what needs to be done and the persistence it takes to eradicate this Darwin winner. I both admire it and fear it.

@danielwylie-eggert2041 Жыл бұрын

Incredible information. Thank you so much for putting this together.

@deBiezel

This is the best video that I have seen on this subject. Thanks!

@katie4408

You have given me some hope! Thank you.

@SuperFeist

This is one of the most comprehensive and well informed videos on knotweed treatment on this platform, thanks for uploading! My quite large patch of knotweed just received its first foliar spraying treatment, after it was very hard for me to just leave it alone for all of summer. I set up a camera to do time lapse videos of the herbizide effect and regrowth next season. What I was asking myself: Soon, the upper parts of the plant will have died of. The rhizome is probably not yet in full dormancy (mid october), but already weakend by the herbicide treatment. Would it make sense to carefully dig free some of the bigger sections of the rhizome and drill vertical holes right into it to fill them with concentrated glyphosate? Idea is that it is translocated all through the not yet dormant rhizome? Anybody ever tried that?

@greglloyd2377

Great content!! Thank you.

@the-lonely-ous1767

Thank you very much. I needed this!

@Hbernhardt22

Great information. I’ve been battling my JKW for over 20 years. All of my recent research aligns with your video so I am ready to attack it correctly this year!