History of Japanese Knotweed in Europe Originally described as Reynoutria japonica by Houttuyn in 1777 from Japan, that name was lost to botanists for over 150 years, in the mean time the same species was independently named Polygonum cuspidatum by Siebold and Zuccarini in 1845. Don’t include personal or financial information like your National Insurance number or credit card details. With 15 years experience in the horticulture sector we endeavour to Knotweed grows in large patches that can quickly push out any other competing plant life. Japanese knotweed is a rhizomatous (produces underground stems) perennial plant with distinctive branching, hollow, bamboo-like stems, covered in purple speckles, often reaching 2-3 m high. 633045. Over the time that he spent in Japan, Siebold collected and recorded over 1,000 different plants, often choosing to plant them in the garden behind his research base on Dejima, an artificial island near Nagasaki. It is native to East Asia in Japan, China and Korea. In winter the plant dies back to ground level but by early summer the bamboo-like stems emerge from rhizomes deep underground to shoot to over 2.1m (7ft), suppressing all other plant growth. If you are a business that wants to burn Japanese knotweed you must tell: You do not need to do this if you’re burning the waste privately as an individual but you should check with your local council that burning is allowed. Report flytipping of Japanese knotweed by calling the Environment Agency on their 24-hour freephone number (0800 80 70 60). Japanese Knotweed was first introduced in the 1850s and has since spread to occupy at least one site in every 10km2 across England and Wales. We use this information to make the website work as well as possible and improve government services. Back in the nineteenth century, when Victorian engineers were designing the latest in transport technology, Japanese knotweed sounded like a … to Japanese knotweed: New England Aster (Aster novae-angliae) Control Methods: Manual control consists of digging out the rhizomes or cutting the stalks. Japanese knotweed thrives in most conditions in the UK and is often found growing on land that has been abandoned or left unattended. Japanese Knotweed was introduced into the UK in the mid-nineteenth century as an ornamental plant in parks and gardens and to line railway tracks in … Very small frag… You could be fined up to £5,000 or be sent to prison for up to 2 years if you allow contaminated soil or plant material from any waste you transfer to spread into the wild. Siebold and his partner Zuccarini, named the plant Polygonum cuspidatum. The plant has worked its way into British vernacular—last year, a group of parliamentarians called Theresa May the “ Japanese knotweed prime minister ”; … 1  It prefers sunny, moist areas, including riverbanks, roadsides, lawns, and gardens. Japanese Knotweed grows freely in Japan and Japan doesn’t suffer from the same affects that we do here in Great Britain. Native to Japan, the plant is considered an invasive species. By the time Japanese knotweed was identified as an invasive threat in 1981, it had already been spread by gardeners, dug up and transported by urban development projects and even used to stabilise soil on the sides of railway lines. Designed to inform homeowners and homebuyers of the local presence of knotweed and the potential risk to their property, the map has already been populated with thousands of … Any business wanting to burn Japanese Knotweed waste must register for a waste exemption (if they can meet the conditions) and notify their local EPR waste team at least a week before they intend to carry out the burning. From their new home in Leiden, these plants would be carefully grown and the packaged up for botanical gardens in Belgium and Britain, with an unmarked box containing Japanese knotweed arriving at London’s Kew Gardens in 1850. In its native land, Japanese knotweed can reproduce naturally and also benefits from a prodigious underground system of rhizomes. That hasn’t stopped it spreading further across the UK, with only settlements in the Northern most region of the countries remaining unaffected. This is the same year that a nursery in Kingston became the earliest recorded nursery to offer knotweed for sale in Britain. The plant is frequently found growing alongside public watercourses such as canals, as well as near railway lines, motorways and public footpaths. We refer to these as Japanese Knotweed “hotspots”. Published 23 August 2018 You may want to consider contacting a Japanese knotweed specialist to make a positive identification before you move forward with talking to any neighbours who might also have the plant on their land. In Britain, banks refuse to approve mortgages on property where knotweed is present. Knotweed Help is a trading style of Cobleys Solicitors Ltd. In 1850, the Leiden nursery despatched an unsolicited parcel of plants, including Japanese knotweed, to the Royal Botanical Gardens at Kew.