18/06/2026
Can you legally treat and dig out Japanese Knotweed on your land?
Absolutely, but if you decided to remove the plant, no vegetation, rhizomes or contaminated soil must leave site.
There are strict controls on the movement of Japanese Knotweed, so all waste must be burnt on site, and buried at specific depths or removed by a company specialising in Japanese Knotweed.
It’s also illegal for homeowners to use commercial herbicide products, as the end user must be registered with Defra, and hold their PA1 and PA6 qualifications at a minimum.
You will still have to declare that Japanese Knotweed has been growing on your property when you come to sell the property and without a management plan in place, it will impact the sale of your property.
Japanese Knotweed may appear to be dead after just one late season treatment around September, but that below ground biomass can still remain viable for over twenty years.
Any soil disturbance in that area, including natural movement could then be encouraged new growth from the energy reserves within the rhizomes.
However, the urban legends that people speak of regarding Japanese Knotweed should be taken with a pinch of salt. Yes, it can exploit weakness, causing property damage and loss of amenity value, but so can many other plants, including Buddleia, Field Horsetail and Bamboo.
Personally, I would rather purchase a property with Japanese Knotweed than one with Field Horsetail.
BBC Derby Derbyshire Times