Understanding, identifying and managing Japanese knotweed
A guide to identifying and managing Japanese knotweed effectively. Essential insights for property owners and managers, construction and developers.
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Japanese knotweed do’s and don’ts
Whether you encounter or suspect knotweed on your property, a building project or as part of a maintenance scheme, please ensure you follow these basic guidelines.
THINK IT MAY BE KNOTWEED?
Finding (or suspecting) knotweed on your land or property can be stressful. To ensure you do the right thing, we advise that you do not touch the knotweed, or attempt to a DIY solution as this will make the affected site worse in the long run.
Follow these four rules to keep the knotweed confined.
DO THIS:
LEAVE the Japanese knotweed alone.
CHECK if you have Japanese knotweed by using a knotweed identification service.
HIRE a certified expert to properly remove Japanese knotweed.
INFORM workers onsite of a possible infestation.
DO YOU HAVE KNOTWEED?
It’s vital for biosecurity reasons to avoid risk of further contamination or spread. Japanese knotweed is classed as ‘noxious waste’ and as such is required to be removed to a licensed landfill, by a licensed contractor. These rules will guide you whilst organising a remediation solution.
DON’T DO THIS:
IGNORE Japanese knotweed. If you’re unsure, verify using a professional service.
DIY or attempt to remove it on your own without professional guidance, as improper removal can lead to its spread.
CUT OR TRIM down the any Japanese knotweed growth.
TREAT the Japanese knotweed yourself with herbicide.
DISTURB the ground within 2-3 metres of the knotweed.
DISPOSE of any knotweed material, or ground within 5m of the knotweed, off-site.
ALLOW TRAFFIC through the affected area.
COVER the Japanese knotweed areas.
Act fast and get rid of knotweed!
download: Japanese knotweed do's and don'ts
More Japanese knotweed do’s and don’ts:
JAPANESE KNOTWEED DAMAGE
- Do: Regularly inspect your property for signs of damage caused by Japanese knotweed.
- Don’t: Underestimate the extent of damage Japanese knotweed can cause to buildings and foundations.
JAPANESE KNOTWEED SURVEY
- Do: Arrange for a Japanese knotweed survey to assess the severity and area of infestation.
- Don’t: Skip regular surveys, especially when selling or buying property in knotweed-prone areas.
JAPANESE KNOTWEED TREATMENT
- Do: Follow a licensed treatment plan for Japanese knotweed management.
- Don’t: Delay treatment once the knotweed is discovered—it spreads quickly and can get worse.
JAPANESE KNOTWEED SPECIALISTS
- Do: Consult with a specialist for complex knotweed issues, especially for legal and survey requirements.
- Don’t: Hire non-specialists who might not fully understand how to handle knotweed effectively or attempt to remove the knotweed yourself.
JAPANESE KNOTWEED DISPOSAL
- Do: Get licensed contractor to dispose of Japanese knotweed waste according to legal regulations.
- Don’t: Leave it in regular green waste or compost – it can still regrow if not handled properly.
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