In this article, and the next several issues I will focus on plants for green roofs located in the western US, Canada, and beyond. Similar content is also covered in Ecoregional Green Roofs: Theory and Application in the Western USA and Canada (Springer Nature, 2021). This book came about from my interest in the kinds of vegetation grown on green roofs located in climates that often experience high daytime temperatures, intense solar radiation and/or many weeks or months without precipitation. From June 1st to October 31st I made a five-month tour of 140 green roofs in the western US and Canada while on faculty development leave (sabbatical) to gather information for the book and to meet with co-authors.
