In a city like Amsterdam, the biggest challenge is that we integrally combine the trees with underground and above-ground infrastructure and other aspects such as groundwater and the intensive use of public space. That is actually the biggest challenge we face: how do we ensure that we can preserve old valuable trees and how do we design new growing-sites so that the trees will grow fast, old and big in the highly densified city. Herman Best of Municipality Amsterdam is interviewed by Jarno van Veelen on the best practices on an urban greening project.