‘Conserving the World’s Most Threatened Trees: A global survey of ex situ collections’ was published in October, 2015. The report highlight that 5,330 trees with conservation assessments are considered Endangered or Critically Endangered globally. This list of the world’s most threatened trees was then compared to ex situ collection records. The survey found that only a quarter of the world’s most threatened trees (Endangered and Critically Endangered) are protected from extinction in ex situ collections. The full report provides guidance on which species to prioritise for collection and how to ensure collections are of greatest conservation value. It also formed the basis for the creation of GlobalTreeSearch.