Ecoman shared this link with me - great project in Toronto (this was a small project done after an extensive 6000 square foot rooftop garden had been created. Cool that once the first project was done - they started looking for other areas that could be improved!)
From Ecoman's website:
GRAVEL GARDEN REHABILITATIONTwo small transplanted honey locust trees () and one lilac suffered a bit in the hot and dry parts of summer but they ultimately became well-established. Finally, later in the season a couple of America Elder (trees were added.
Love that they rescued some trees from a Canada Blooms installation (saving costs!) for the Gravel Garden. And do hope that they post some after shots - would be great to see what it looks like now.
Thanks Ecoman (Jonas Spring) for sharing the info!