Japanese Knotweed is the most invasive plant growing in the UK today. It can grow up to 10cm per day. The Rhizome (root system) below ground is the biggest problem. The plant is capable of undermining drains and other under ground services and finds weaknesses in concrete / foundations allowing the plant to cause damage.
All of our technicians our qualified to NPTC PA1 / PA6/ PA6AW and are CSJK qualified (Certified Surveyor in Japanese knotweed) with over 7 years of Japanese Knotweed company knowledge.
If you think you have Japanese Knotweed, please call Southwest Knotweed and we would be more than happy to conduct a survey and establish the best cause of action. We cover all parts of Cornwall, Devon and Somerset.
The most common species of Japanese Knotweed is Fallopia Japonica and is native to Japan.
Japanese Knotweed was introduced to the UK in the 19th century as an ornamental plant and is now common and widely spread across the UK from Penzance to Inverness. The plant in the UK is only female. It spreads via natural means such as humans, animals, wildlife, watercourses by means of fragments of rhizome and stem and doesn’t produce seeds in the UK.
This has negative impacts in the UK such as out-competing our native British plants and also adding to river bank erosion, which in turn will increase the the risk of flooding.
Japanese Knotweed also has an economical negative impact, causing significant delays in construction as well as the potential of structural damage including drains and under ground utilities, not to mention the plants capability of growing through weaknesses of hard surfaces and asphalt.
Japanese Knotweed is listed under Schedule 9 of the Wildlife and Countryside Act 1981 with respect to England, Wales and Scotland. As such it is an offence to plant or otherwise cause Japanese knotweed to grow in the wild. Under the Environmental Protection Act 1990. Japanese Knotweed is classified as controlled waste.