In brief
Researchers at the University of Cambridge highlight the increasing danger of "hitchhiking intruders" like snakes and frogs in global plant shipments, emphasizing the urgent need for improved import standards to protect ecosystems.
In a concerning revelation, scientists are sounding the alarm about the hidden wildlife residing in potted plants and cut flowers being imported worldwide. Stowaway snakes, frogs, lizards, spiders, and other insect pests pose significant ecological threats, according to researchers from the University of Cambridge. Recent instances include a tree frog that emerged from a bouquet in Sheffield and snakes found in ornamental olive trees shipped across Europe.With the global plant market expanding rapidly, researchers warn that the potential for invasive species wreaking havoc on agricultural systems and local environments is growing. Prof. William Sutherland of the University of Cambridge commented, “Adult snakes and lizards are just the tip of the iceberg. If larger animals are slipping through, imagine the small insects and fungi—those are the real problems.” The ornamental plant production sector is undergoing substantial growth, particularly in regions such as East Africa and South America. Despite existing regulations and customs checks, the staggering volume of cut flowers and plants traded makes it virtually impossible to catch every pest and disease. Dr. Silviu Petrovan from the University of Cambridge noted, “Even with stringent customs measures, unwanted wildlife is often successfully making its way through import checks.”The presence of exotic reptiles and amphibians stowing away has been reported frequently, especially in the UK and across mainland Europe. Frog and lizard populations are now being dubbed “hitchhiking intruders” that accompany the potted plants and flowers that arrive from countries like Colombia and Ecuador.In new findings published in the journal Bioscience, the research team analyzed pest records gathered at customs in the Netherlands from 2017-2018 and the UK from 2021-2023, pointing to a significant number of invaders, including various gecko species and snakes. The scientists are advocating for enhanced production standards and improved data sharing regarding risks associated with the international plant trade.
