Like Japanese knotweed, giant hogweed can be eliminated by physical removal or by applying chemicals. Mature leaves are lance shaped and can reach 20 cm in length. Himalayan knotweed can have white or pale pink flowers. Types of Weeds. We offer Japanese knotweed control in York BB6 8 to prevent damage in your garden or property. They are very fast growers and can reach full height by the end of June. For any help in removing Himalayan Balsam or Japanese Knotweed, please contact Japanese Knotweed Specialists. Threat The other three types of knotweed present in Ireland all pose the same threats as Japanese knotweed. Himalayan knotweed (Persicaria wallichii) is a species of plant in the knotweed family and is sometimes referred to as cultivated knotweed. Japanese Knotweed was introduced in the UK in the 1850's as an ornamental plant and as a fodder plant. If you are still unsure as to whether you might have an infestation of Japanese knotweed on your property, please send us a picture for a free assessment, below. Read our guide on plants that look like Japanese Knotweed including Bindweed, Himalayan Balsam, Bamboo, Russian Vine and more. It has been claimed that the weed can damage buildings and foundations, though there … Himalayan Balsam was brought to the Uk in 1839 by the Victorians as an Ornamental plant, along with other invasive species such as Japanese Knotweed and Giant Hogweed. Himalayan knotweed is a perennial, herbaceous plant with a woody root. Ideally, you want to catch the plant in its early development in the spring or the beginning of summer. Himalayan balsam can stand low light levels and it also creates shade over other plants, so gradually destroying habitats by killing off other vegetation that is in its way. Himalayan Balsam. It was popular due to it “Invasive Splendor” meaning it was affordable to all as only a few seeds would allow you to establish an ornate garden. Himalayan knotweed . Reynoutria japonica, synonyms Fallopia japonica and Polygonum cuspidatum, is a large species of herbaceous perennial plant of the knotweed and buckwheat family Polygonaceae. Their rhizome (root) can grow through concrete, drains, and bricks and mortar. Alternatively, feel free to send us an image via email and our experts will be able to identify the plant species for you. Himalayan Balsam removal. Japanese Knotweed Is A Natural Laxative. Japanese Knotweed Control in York. Flowers are held on red stalks. Stems are 2-3 m tall and are branched in the upper half. Heavy rain forced the rivers Severn and Wye to flood last year allowing plants as Japanese knotweed, Giant Hogweed and Himalayan Balsam to be spread by floodwater before taking hold in new locations. Whilst Japanese Knotweed is not dangerous to humans, it can cause ecological destruction if left to grow. Japanese knotweed is now on the list of the 100 most invasive species in the world. Japanese knotweed is dangerous because of its extensive underground roots, which can cause damage to driveways, drainage systems, boundary walls and gardens if left untreated. The flowers are followed by growing seed pods that open explosively when they are ripe. It was introduced to the UK in 1839 and is now a … Who We Are. Read more about Giant Hogweed. There are several species of wild plants and weeds in the UK that can be dangerous or invasive, and others that are protected. For help in identifying Himalayan Balsam, you can contact Japanese Knotweed Specialist. Japanese knotweed is not dangerous in the sense that it is not poisonous to humans or animals, yet it’s impact on the environment can be huge. 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