^As a gardener, designer and someone who helps maintain an 80 acre old-growth forested wood lot, I disagree. The river valley is unique and a gem for a city our size, but much of it is 'unmanaged greenspace'. A lot of it is weed species, filled with garbage and there's at ton of dead trees that are just waiting to become an out of control fire.
The city can and should maintain our greenspaces, and prioritize where they can do extra planting, or perhaps ask for help from the communities that surround it. I was in Calgary yesterday and the level of maintenance, detail in their planting scheme Downtown and in the core was far beyond anything we do here.
Some of what is shown in the photos from Van aren't possible here, but what is shows is a level of care and detail for the public realm that often doesn't happen here. We're getting better, urban areas absolutely need more care and attention to detail than the middle of the river valley for instance.