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Originally Posted by toddguy
Can you elaborate or give me a link to show that this is so? For all trees? Also these are barely trees-the ones at the top definitely could be just tall shrubs-they only look to max out at 15 to 20 feet. Could hardy shrubs suffice? Is there information out there that shows at which elevations smaller plants besides trees would not survive? The higher elevations could be taller shrubs and vines maybe? There are shrubs which are root hardly to way below 40 below zero F.
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There's plenty of info readily available online. Certain strong shrubs could likely survive at major heights on buildings with a ridiculous amount of maintenance per shrub. But it really doesn't make much sense, and is certainly not "sustainably green".
It's not so much elevation itself being the factor... it is the extreme conditions trees would be subjected to
on a building at high elevation. A tree rooted in minimal soil at even 300 feet on the side of building, where it will be constantly pummeled by winds, intense direct sunlight, extremes of hot and cold temps, and periods of intense precip or dryness, is simply not going to survive very long... or will definitely not be green and thriving, but rather wind burnt, brown, and dry.
At 700-1000 ft... in order to see this much greenery from a ground vantage point, they'd have to be trees: