Reducing the Impact of Non-Native Species in Europe

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Azolla filiculoides
Azolla filiculoides

Urban Invaders!

Urban areas are hotspots for invasive non-native plants. Introduced as ornamental features, many non-native plants have escaped from gardens and become established in the wild, where they out-compete native flora, choke waterways and impact our economy. 

Our new survey - Urban Invaders - aims to help improve the data quality on some of the most damaging invasive plants, including Japanese knotweed, Himalayan balsam and giant hogweed. 

We need YOUR help: tell us when and where you see them!

We're looking for records of six invasive plants which were imported as ornamental species for gardens and parks and have since escaped, established and started causing damage to the local environment.

The six Urban Invaders are:

  • Japanese knotweed
  • Himalayan balsam
  • Giant hogweed
  • New Zealandpigmyweed
  • Floating pennywort
  • Tree of Heaven

Click here to see our guide for these Urban Invaders. 

 Get Involved!

  • Submit your records using our free Smartphone app 'That's Invasive!' for Android and iPhone - don't foget to tag #urbaninvaders
  • Submit your records online with NBIS - www.nbis.org.uk/UrbanInvadersSurvey
  • Email your records directly to us - nnnsi@norfolk.gov.uk
  • Post your records to: RINSE, Norfolk County Council ETD Room 301, County Hall, Norwich, NR1 2SG
  • Pick up one of our leaflets from your local library (Norfolk only) or download our ID guide

Japanese Knotweed - Angus MacAskill

Floating pennywort (Hydrocotyle ranunculoides) choking a waterway - Simon Mortimer