Increasing the place of plants in cities plays a key role in mitigating the urban heat island effect, but trees must be addressed as a systemic issue, interfacing with the air, the ground, and water. For Frédéric Ségur, we must re-engage with the knowledge of urban forestry in order to regain our intelligence of trees and counter the mistaken assumptions on their life expectancy in urban settings. Beyond political declarations, the idea is to plant well rather than simply a lot, and to provide adequate conditions for them to develop—including space and living soil—and to take into account the ecotypes, but also to get the plant palette to change in relation to climate change.