Does any one know how to get rid of Japanese Knot Weed?
Related Discussions
GNATS - How to get rid of them?
Somehow my house and garden got tiny gnats that killed my fuchsia plant and fly everywhere. I have tried ALL the Web recommendations - soap and oil dishes, sand in th... See more
Marigolds growing! Should I pinch the buds?
My marigold plants are growing. I heard that pinching the buds until Autumn will allow them to grow without killing the plant. Is this true?
Growing garlic
Growing our first garlic, should we wait until the leaves are drying out before we pick it? Husband picked first one today along with our first potatoes.
How to keep mice out of your garden?
Hi everyone, I have mice in my garden destroying my vegetables and I have also noticed them in the barn and shed. Please can someone tell me how to prevent them from ... See more
What's the best flower/plant to grow in Texas?
I know that opinions vary, but what's your opinion?!I have great luck w Rosemary plants. Green all year long.
Can someone tell me what kind of animal this was in my yard?
I thought maybe a rabbit was burrowing in my yard, but it's almost dead center of my lawn (not a very smart rabbit). The hole is not very deep, and I replanted it onc... See more
Is Creeping Charlie in your lawn a good thing or a bad thing?
Is there a sure-fire way to get rid of Creeping Charley?
https://www.thespruce.com/eradication-of-japanese-knotweed-plants-2131201
Do not spread any soil that has been contaminated with Japanese Knotweed rhizome as new plants will sprout.
The most common method for how to kill Japanese knotweed is using glyphosate based herbicide, such as Round-up. You will need to use undiluted or at least a high concentration Round-up on this weed. Remember that this is a tough plant and one application of herbicide will not kill Japanese knotweed, it will only weaken it. The idea is to spray it repeatedly until the plant uses up all of its energy reserves while trying to regrow repeatedly.
You can also try calling your local city hall or extension service. Due to the highly invasive nature of this plant, some areas will provide free spraying of Japanese knotweed.
Another control method for Japanese knotweed is mowing. Chopping down the plants every few weeks will start to eat away at the plant’s energy reserves as well. Another way to get rid of Japanese knotweed is to dig it out. You will want to dig out as much of the roots and rhizomes as possible. Japanese knotweed can and will regrow from any rhizomes left in the ground.
No matter how well you dig up the roots, there is a good chance you will miss some of the rhizomes, so you will need to watch for it to start regrowing and dig it out again.
The most effect Japanese knotweed control is to combine methods. For example, mowing and then spraying weed killer will make your efforts at killing Japanese knotweed twice as effective.