Planting trees on rooftops?

I recently visited Cira Green, a park in Philadelphia that's located on top of a parking garage, about 100' off the ground. The park features numerous garden beds and native trees. There are a number of challenges that come with planting trees on elevated surfaces including soil volume and mixture, wind, and a dynamic load. However, when done correctly, these green roofs can offer numerous benefits including wildlife food and habitat, storm water control, and providing the public with a nice public place to visit. More info: https://ciragreen.com/ https://developingresilience.uli.org/case/cira-green/ Follow me on TikTok and Instagram for more trees, plants and nature! https://www.tiktok.com/@andrew_the_arborist https://www.instagram.com/andrewthearborist/ LinkTree - https://linktr.ee/AndrewConboy