The whole point of this development is the tree cover, it's being sold on it, and purchasers are expected to pay premium prices for it. Those trees will be planted.
Whether they flourish or not, only time will tell.
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There has been discussion in the Arborist/Forestry community about this project.
Lots of discussion about the kind of specialty training and equipment that would be required to maintain it.
It isn't being opposed as an idea at all; but certainly many have questions as to feasibility.
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In terms of the plants flourishing, some of their choices absolutely could, if they have enough space, soil quality, water, and proper maintenance.
One issue for many of these plants, close to a building wall, is that they will all tend to grow lopsided towards the sun.
A combination of staking and pruning can make that work, but there will certainly be on-going costs.
One particular challenge will be tree removals, from what I'm hearing, the consensus is that these will have to be done by crane.
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They've got quite a few imported species in their list; most are not at risk of being invasive here, and even those that are should probably be fine in this setting.
But several I have no practical experience with and couldn't hazard a guess as to how they'll do.
I rather expect the reason their species is list is so long is about experimenting to see what works.
I suspect the safest choice they have is Red Cedar which is very hardy.