Warnings of stowaway snakes and tree-frogs hiding in pot plants

Getty ImagesA snake was discovered on ornamental trees transported across mainland EuropeFrogs, lizards, snakes, spiders and other insect pests are being transported across the world on cut flowers and potted plants, with the potential to harm nature, according to scientists.These "hitchhiking intruders" have included a tree frog that emerged from roses at a florist's shop in Sheffield and snakes discovered in…