11. Japanese Knotweed

Question 1

What is Japanese Knotweed?

Answer 1

Invasive plant which is hard to control and can damage hard surfaces such as foundations and tarmac

Of great conern to property lenders who may refuse a loan if it is present or nearby to a property

Question 2

How should japanese knotweed be removed?

Answer 2

Chemical treatment, digging it out and removing from sit eto a licensed landfill site. Specialist company to be appointed to remove and dispose of it.

(in accordance with the Environmental Protection Act 1990)

Question 3

How to identify Japanese Knotweed?

Answer 3

Reddish purple stem, white flowers, heart/spade shaped leaves.

Question 4

What is the associated RICS Professional Standard surrounding Japense Knotweed and residential properties? What does it include?

Answer 4

RICS Professional Standard: Japanese Knotweed and residential property, 2022

Contains a decison tree based on risk level to help valuers determine the appropriate management approach.

Question 5

Why did Japanese Knotweed come to the UK?

Answer 5

Railway companies used it to secure up the banks of railway cuttings as it is incredibly effective at making soil not slip.

Question 6

What are the penalties surrounding Japanese Knotweed?

Answer 6

Allowing it to spread is a criminal offence.

Local authorities can grant community protection notices (CPN) and fines if ignored.