Japanese Knotweed Distribution Heatmap

Where has Knotweed been found in the UK?

Exposed: The Japanese Knotweed Heatmap is an interactive online heatmap of Japanese knotweed sightings across the UK. Designed to inform homeowners and homebuyers of the local presence of knotweed and the potential risk to their property, the map has already been populated with thousands of infestations.

Look out for Japanese knotweed

Check out these knotweed images below

New red shoot appears in spring resembling asparagus

Distinctive shield shaped leaves with alternating sub-branches

Clusters of attractive white flowers in summer

In winter the yellowy orange leaves will eventually turn brown

Other resources

When it comes to knotweed, we want to help keep you informed

Worried about whether the property you own or are looking to buy is affected by Japanese knotweed? Japanese knotweed can devalue a property by 10% or more. We can survey the property and assess the risk. Insurance backed guarantees can be provided to restore the property’s value.

Report Sightings – join the fight against Japanese knotweed

You can join the fight against Japanese knotweed by reporting any sightings of Japanese knotweed online, using your smartphone, tablet, or desktop computer. We’ve made it really simple, it takes just a few seconds. Click “Add Sighting”, zoom in on the satellite view and click the central position of the knotweed location. You’ll only be asked to define the size of the infestation, some further information is requested but is optional. No sign-in or passwords are required.

If you have something in your garden, or you spot something suspicious while you're out and about, use our comprehensive guide to Japanese knotweed Identification to check you've got it right. Not only can we help verify whether it's Japanese knotweed, we can help remove it too.

Wherever possible we’ll verify new sighting reports to keep the Heatmap as up-to-date as possible.

View the UK knotweed problem as a whole

Heatmap details

Learn more about how we built it and how it helps

This tool is an invaluable source of information to property professionals involved in transactions such as chartered surveyors, conveyancing solicitors and estate agents. Where a high number of knotweed sightings appear nearby, homebuyers may wish to instruct a Japanese knotweed survey to check the likelihood of the property they intend to buy being affected or at risk of encroachment from infestations in the vicinity.

Exposed, the Japanese knotweed Heatmap

Our Regional Director explains how our popular heatmap works.