Japanese Knotweed FAQs
Japanese knotweed is a highly invasive plant that spreads rapidly and can cause damage to property which can impact its value. It is an offence to allow or cause this plant to grow in the wild. You could also become liable for damages if allowed to spread onto neighbouring property. If you suspect you have japanese knotweed, do not attempt to deal with it alone, but call in the professionals.
While not harmful to humans, its potential for damage comes from its invasive roots and fast growth rate. In ideal circumstances, Japanese Knotweed can grow up to 10cm a day, and as it spreads it can damage hard surfaces, like concrete, tarmac and brick walls.
There are a number of options for controlling Japanese knotweed from herbicide treatments, excavations with relocation to burial options and off site disposal. These methods can also be combined for increased success of lasting control.
Starting from small red shoots similar to asparagus in the spring and growing up to 3m tall in the summer with hollow canes and vibrant green heart/shield shaped leaves. This plant produces white flower clusters in autum before dying back for winter leaving a bare brassy footprint of dead hollow canes.
Japanese knotweed can manipulate weaknesses and cracks in concrete and other building and drainage structures. If ignored, Japanese knotweed can undermine the integrity of these structures causing structural risk and potential damage.
There are many plant species in the UK that are harmful to humans and animals, although not being poisonous, Japanese knotweed can cause house and building damage.
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. Typical damage from Knotweed includes damage to tarmac and paving.
No, As the Japanese knotweed in the UK is female only, the seeds produced are not viable and cannot cause spread. The Spread of Japanese knotweed nationwide has been primarily via human contact.
Lenders are cautious with properties that are affected by Japanese knotweed, but its not impossible to get a mortgage or re-mortgage. It is a legal responsibility to declare the presence of Japanese knotweed in your home report. A lender may refuse a mortgage application if Japanese knotwed is not professionally managed with sufficiant guarantees.