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You can find a complete list of IPSN member gardens here

The increasing globalisation of trade in plants and plant material, together with the impacts of climate change, has led to an increase in the introduction and spread of new and damaging plant pests and pathogens. Past examples of the devastating impact these organisms can have on plant populations (prime examples are Dutch elm disease on UK elm trees and the emerald ash borer on U.S. ash populations) illustrate the significant threat these alien pests and pathogens pose to global plant health. 

The International Plant Sentinel Network (IPSN) is being developed to facilitate collaboration amongst institutes around the world, with a focus on linking botanic gardens and arboreta, National Plant Protection Organisations (NPPOs) and plant health scientists. The aim will be for these institutes to work together in order to provide an early warning system of new and emerging pest and pathogen risks. Member gardens will help to provide scientific evidence regarding known quarantine organisms and potential new risks to NPPOs in order to inform plant health activities and thus help safeguard susceptible plant species worldwide.