Japanese knotweed is not only invasive, it is delicious. Protect soil and water quality from herbicides by regularly harvesting the plant's abundant shoots for friends, farmers' markets and restaurants. Market by emphasizing its tangy sweetness and similarity to asparagus and rhubarb.

If it spreads vegetatively, doesn't mowing or weedwacking spread it as well?

Yep!

The threat of Japanese knotweed has nothing really to do with losing a fly.

I can’t believe you think Glyphosate is an option that is water safe. Ridiculous

How about weaving the not weed under and around itself to stop it from spreading?

I've been spraying one patch of knotweed repeatedly during the year for SEVEN years now. The patch STILL isn't completely dead. This is the weed from Hell.

Chinese médecin use the root and stern.

Good Lord it's good for bees And it makes a reddish honey that's the best. Don't kill it And good Lord Your the problem why bees are dying with the sprays etc. Nothing is a weed ....

I eat it . Love it. Some of the best Fishing Creeks are Full of Knotweed and Fish and Crawfish etc. Stop spraying, Foolish. Been Indoctrinated

He says glyphosate, so it can be Roundup. The 1L bottles labeled Biactive are reasonably cost-effective, they contain twice as much of the active ingredient than the plain green Roundup. I'd say a 4% solution will be fine against knotweed. Make sure you use all-plastic spraying equipment as Roundup would react with metals. If you are so inclined, you can inject a more concentrated solution into the plant's stem; this is needed for the marvelous professional results.

I'm battling knotweed right now with Roundup, and garlic mustard is within 1/2 mile of my 14 acres. I will not allow it to take over.

you are using poison.

The Nature Conservancy+Glyphosate