Japanese knotweed removal
Japanese Knotweed is not easy to eradicate and experts estimate that it usually takes five years to successfully do so with chemical treatments or a large amount of topsoil has to be removed and destroyed by specialist facilities.
There are various ways to deal with it, but it must be remembered that even if a tiny amount of roots or stems are left behind by accident, the knotweed will soon re-establish itself with a vengeance. For more information see: https://www.rhs.org.uk/advice/profile?pid=218
Below are some methods but we highly recommend seeking professional advice before attempting to deal with the plant.
Japanese knotweed removal cost
Removal costs vary but you would be looking at a few thousand pounds and treatments can vary depending on which you select, if (for example) you selected chemical you would need to keep retreating the weed and there is no guarantee on its success so there can be a reoccurring cost for an option like that. We’ve covered some ways the weed is removed but we always recommend seeing professional help with any Japanese Knotweed infestation.
Cutting and burning knotweed
These two methods are really effective at clearing the fast-growing knotweed on the surface, but unfortunately neither damage the root system, so in both cases, the knotweed will soon re-appear, it’s not recommended as you may accidentally spread the weed.
Removing knotweed by digging
This is a very laborious task because of the intricate network of roots which must be carefully removed so that they remain intact – just 0.75g of root material (around a fingernail size) is all that is needed for the knotweed to grow again, so needless to say, this method is not always successful and best left to professionals who will normally give insurance backed guarantee on their work, they’ll also dispose of it.
If you do decide to tackle your knotweed this way, you will have to gather it all up really carefully so as not to leave any in situ and dispose of it all equally carefully as the Environmental Protection Act of 1990 lists Japanese Knotweed as ‘controlled waste’. This means that the knotweed must be taken to a licensed landfill site for disposal, this can have associated legal fee’s and we really don’t recommend attempting any DIY attempts which can sometimes just spread the weed instead of destroying it.
The correct herbicide must be used on the knotweed as it is essential that the herbicide permeates and destroys the root system. Chemicals containing glyphosate are usually needed and even then, they can take several years (and treatments) to totally eradicate the problem.
Having a Japanese knotweed specialist treat it is best, but will cost several thousand pounds.