Japanese knotweed is an aggressive, fast-growing plant that quickly forms clumps in the spring. The annual stems are tall and densely packed, and each year new stems sprout from the sturdy and deeply anchored rhizomes (creeping underground stems) which spread rapidly across the ground. Originally brought to Britain as an ornamental garden specimen, Japanese knotweed has since become a pesky non-native species that requires control.
During the spring, reddish-purple shoots emerge from a base of crimson-pink buds. These canes then grow quickly, forming lush stands that stand up to 2.1 meters (7 feet) tall. Characteristic purple flecks run along the length of the cane and branches sprout outward at nodes along its length.
Japanese knotweed is capable of sprouting from even the smallest pieces of rhizomes, and though it rarely sets seed in the UK, causes for concern have been raised. In 1981, a provision was set in place under the Wildlife and Countryside Act which established that it is illegal to cause Japanese knotweed to grow wild.
As of 2013, sellers have been required to disclose whether Japanese knotweed (Fallopia japonica) is present on their property using the TA6 form in the course of conveyancing and enquiries. If a property survey notes the presence of Japanese knotweed then professional assistance will be needed to properly remove it.
Professional companies provide Japanese knotweed removal services, including risk assessment for mortgages, treatment plans, and insurance-backed guarantees as needed. Additionally, the Royal Institution of Chartered Surveyors (RICS) has partnered with the Property Care Association (PCA) to form the PCA Invasive Weed Control Group (IWCG). This trade body registers and vets consultants and contractors who specialise in removing Japanese knotweed.
