The purpose of these guidelines is to provide a consistent methodology for public garden staff to develop and categorize a list of cultivated taxa observed escaping from their locations of cultivation. The recommendations are meant to guide public gardens in the development and use of independent lists and to encourage data sharing with other gardens in the interest of preventing new plant invasions. These guidelines were developed by the PGSIP Working Group whose membership represents six public gardens and one invasive plant council. PGSIP’s primary goal is to encourage, capture and pool public gardens’ information about taxa demonstrating an ability to escape cultivation to improve the quality and quantity of data available for drawing conclusions about overall invasiveness.