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UK's worst Japanese knotweed hotspots revealed

Do you live in an area infested by Japanese Knotweed?
What is Japanese Knotweed?
Data and methodology
20. Isle of Wight (0.85 incidences per sq km)
19. South Yorkshire (0. 91 incidences per sq km)
18. Conwy (0.94 incidences per sq km)
17. Gwynedd (0.99 incidences per sq km)
16. West Midlands (1.01 incidences per sq km)
15. Derbyshire (1.01 incidences per sq km)
14. Monmouthshire (1.4 incidences per sq km)
13. Channel Islands (1.42 incidences per sq km)
12. Lancashire (1.48 incidences per sq km)
11. Rhondda Cynon Taf (1.62 incidences per sq km)
10. Caerphilly (1.82 incidences per sq km)
9. Neath Port Talbot (2.14 incidences per sq km)
8. Greater Manchester (2.23 incidences per sq km)
7. Greater London (2.29 incidences per sq km)
6. Merseyside (2.49 incidences per sq km)
5 Merthyr Tydfil (2.57 incidences per sq km)
4. Bridgend (2.9 incidences per sq km)
3. Swansea (3.58 incidences per sq km)
2. Bristol (5.18 incidences per sq km)
1. Cardiff (6.74 incidences per sq km)
How to identify Japanese knotweed
What to do if there is Japanese knotweed on your property
Japanese knotweed treatment and removal
Can Japanese knotweed devalue your home?
How does Japanese knotweed affect mortgage applications?
Can I sell a house with Japanese knotweed?
Be part of the fight against Japanese knotweed
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Environet

Do you live in an area infested by Japanese Knotweed?

Over the past few years, Japanese knotweed has gone viral in more ways than one. As Britain's most aggressive, non-native plant, Japanese Knotweed is now affecting 5% of UK homes, according to invasive plant removal specialists Environet.

Analysing the data, generated from the over 57,000 known cases across Britain, Environet has revealed the top 20 places in the UK where the weed is most prevalent.

Click or scroll on to find out if you live near a Japanese knotweed hotspot...

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Jen Grimble

27 March 2025

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