Due to their unique status as living museums of plants from around the world, public gardens and arboreta can play an important, pro-active role in assessing which non-native plants exhibit invasive tendencies. These institutions have the access and staff expertise to observe the reproduction and spread of plants that are not well known and may not be available in the horticultural trade, and can make recommendations about these plants’ capacity to become invasive based on those observations. The Public Gardens as Sentinels against Invasive Plants (PGSIP) initiative has developed guidelines and a database for public gardens in North America to share information about plant taxa they are observing escaping from cultivation. The observations shared by public gardens have enabled PGSIP to develop resources that can help with invasive species detection and response. Learn more about the resources available from PGSIP and how public gardens can contribute to this growing body of data.