Japanese Knotweed Is Coming to Wreck Your Backyard—and Much, Much Worse
(WTH is this a metaphor explaining? Why is the WSJ publishing it?)
The invasive plant can grow up to 3 feet a week, wreaking havoc on your property or damaging the foundation of your home1/2
Sure, Japanese Knotweed is pretty. But within it lies the heart of a house-eating predator.
Kris Frieswick hedcutBy Sept. 5, 2024 9:00 am ET
The forest behind our house has turned into a horror movie, starring an armada of non-native invasive weeds. Their evil, tendrilly arms reach out like bright green zombies to smother everything in their path, albeit very slowly. Our trees have been encircled, their leaves dying before our eyes. Our pear tree silently screams for help.
I called our landscaper to confirm, pretty please, that we were not in the grips of a demonic plant that has been colonizing our area: Japanese knotweed.
If you’ve never heard of Japanese knotweed, count your blessings. It was brought to the U.S. from Japan in the mid-1800s by shortsighted botanists who also brought over kudzu and oriental bittersweet. Japanese knotweed and its pals promptly spread, unhindered by its natural predators. Knotweed is now all over the U.S., though it is partial to watery areas with disturbed soil and as little as possible obstructing its plans for world domination.
Japanese knotweed looks like a clumpy, bushy bamboo plant. Its white flowers, which appear in late summer, are beautiful. The plant requires almost no care to thrive and does so very quickly. These qualities made them very popular with gardeners ignorant to the weed’s inherent evils.
Its stalks can grow up to 3 feet a week. Its underground stems, or rhizomes, can expand by multiple feet each growing season, which runs from spring to early fall. It pushes out native plants unfortunate enough to live on land it covets. It is relentless and strong and its roots can send up shoots that can push over retaining walls, lift up walkways and road surfaces and grow up through cracks in asphalt and concrete foundations, where it can wreak structural havoc.
==JAPANESE KNOTWEED RHIZOMES DO NOT COME TO PLAY.–
The rhizomes are nearly impossible to eradicate. They must be physically, and entirely, excavated from the dirt or poisoned with pesticide. Neither option is easy or fast—both typically take at least three years to keep it from sprouting anew, according to Robert Naczi, the curator of North American botany at the New York Botanical Garden. A new plant can sprout from a tiny root fragment. If you manage to remove every morsel, great care must be taken in its disposal or it’ll take root wherever it ends up, like an MLM salesperson.
• It can live in wet or dry conditions, near freshwater or salt, disturbed or undisturbed soil, cold or warm climates. It’s the O.G. Audrey II.
• “You have to respect this plant,” says Naczi. He’s been respecting it up close and personal lately: his neighbor has an infestation that might breach his property line if it isn’t dealt with soon. “They’re known to grow inches per day in the spring.”
• The U.K., where it is far more rampant, has basically given up on eradication, calling it an unrealistic goal. When the Brits give up, you know it’s bad.
Until recently, some U.K. banks wouldn’t give mortgages for homes that had the plant growing on the property. However, after gallons of legislative ink was spilled and hours of Vogon-like study conducted by various official U.K. bodies, it was announced in 2020 that Japanese knotweed wasn’t the herby Armageddon everyone thought it was, as long as it is monitored and treated.
That’s not to say it isn’t horrible. U.K. home sellers are legally required to disclose the presence of knotweed during a sale. Homeowners can be prosecuted for causing it to spread into the wild. Residents who find it on their land are advised to take out knotweed insurance, a five- to 10-year policy that pays for the annual treatment that, at best, will keep it at bay. Still, even with the new chill-out directive, knotweed’s presence on or near a property, even with proper maintenance in place, negatively impacts home values.
https://archive.is/P5x76#selection-2209.0-3713.5