These plants are especially invasive along streams and rivers. Jan Samanec, State … 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. https://phys.org/news/2018-07-japanese-knotweednot-knotty-problem.html Japanese knotweed is a beautiful ornamental plant that may be too aggressive for its own good. The Japanese Knotweed in the UK is a clone of the original plant brought in to Kew in the 1840’s – it has no close relatives amongst our native flora or our farmed crops – and as such has been identified as a perfect target for bio-control. His three most profitable lines of work are personal injury suits, bad landlords, and Japanese knotweed. The best time to spot Japanese knotweed is during mid-summer and early autumn. When I first spoke to Montaldo, he was riding his bicycle outside the city. 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. Its leaves are vibrant green ovals that sprout white flowers in the fall. Japanese knotweed has long been feared by property owners, and London is a hotspot. Its ornate aesthetic makes it an attractive plant to add to a garden. 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 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 … Be careful when planting in the home landscape for you may rue the day you placed it in the garden. 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