Its leaves are vibrant green ovals that sprout white flowers in the fall. Overview Information Knotweed is an herb. These plants are especially invasive along streams and rivers. Japanese knotweed has long been feared by property owners, and London is a hotspot. Japanese knotweed spreads primarily by seed (transported by wind, water, animals, humans, or as a soil contaminant), stem fragments, and by shoots sprouting from its system of rhizomes. Japanese knotweed is no more dangerous than buddleia because it doesn't cause structural damage to homes, researchers claim Lenders can deny people mortgages unless they hire a knotweed removal firm Japanese knotweed showing oblate leaves and flowers. Its ornate aesthetic makes it an attractive plant to add to a garden. The best time to spot Japanese knotweed is during mid-summer and early autumn. Japanese knotweed is a beautiful ornamental plant that may be too aggressive for its own good. The strong roots can rampage under fences, damage paths and patios and work their way inside the cavity walls of houses, even emerging two storeys up out of the chimney stack. https://phys.org/news/2018-07-japanese-knotweednot-knotty-problem.html The whole flowering plant is used to make medicine. Japanese knotweed can grow up to 10cm per day, and because of this rapacious growth, it has been known to cause damage to building structures and substructures by targeting weak points, such as cracks in masonry, and attempting to grow through them. Why is Japanese knotweed bad? Jan Samanec, State … When I first spoke to Montaldo, he was riding his bicycle outside the city. Fortunately, some recent research has taken a close look at exactly what Japanese knotweed can and can’t do, and the results, published in the journal PeerJ, may not be … Japanese and giant knotweed can displace the native trees that protect our water quality. 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