We demonstrate how native and nonnative plant taxa used as ornamentals in private and public urban green spaces can significantly strengthen plant conservation in time of extinctions by expanding the capacity for ex situ living collections and raising awareness among professional and private gardeners and plant collectors. Based on global databases, we document the current representation of threatened plant taxa in horticulture compared to collections in botanical gardens. A substantial number of threatened taxa are already used in gardening, however, there is great unused potential—especially to reach high enough representation of genetic diversity and plant material for reintroduction and restoration programs. Considering urban greening as an integral part of ex situ conservation strategies can provide critically needed additional space and human resources for ex situ collections, while increasing the often low genetic, species and phylogenetic diversity of many newly established plantings that make them vulnerable to climate change and disease risks.

中文翻译：

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园艺植物作为迄今为止被忽视的迁地保护支柱

我们展示了在私人和公共城市绿地中用作观赏植物的本地和非本地植物类群如何通过扩大异地生活收集能力并提高专业和私人园丁和植物收集者的意识，显着加强植物在灭绝时期的保护。基于全球数据库，我们记录了园艺中受威胁植物分类群与植物园收藏品的当前表现。大量受威胁的分类群已经用于园艺，然而，还有很大的未利用潜力——特别是在重新引入和恢复计划中达到足够高的遗传多样性和植物材料的代表性。