General

Global Invasive Species Database
www.issg.org/database/welcome

CABI Invasive Species Compendium
www.cabi.org/isc

Great Britain

GB Non-Native Species Secretariat
www.nonnativespecies.org

Centre for Ecology and Hydrology
www.ceh.ac.uk

Food and Environment Research Agency
www.fera.defra.gov.uk

Countryside Council for Wales
www.ccw.gov.uk

Natural England
www.naturalengland.org.uk

Scottish Natural Heritage
www.snh.org.uk

Defra
www.defra.gov.uk

Invasive Species in Ireland
www.invasivespeciesireland.com

Recording Invasives
Plant Tracker
www.planttracker.naturelocator.org