Probably because it’s an overused “eyewash”, or I should say, “greenwash” kind of trick. Something that looks nice on a drawing but isn’t very practical. I think Quora user Souma gave you a perfect answer from an architectural standpoint. From a horticultural standpoint, it is a difficult environment - hot, dry winds and temperatures during the summer, freezing rain and sleet during the winter. Nevertheless, I have seen buildings with an interior courtyard-type structure with soil, shrubs and even trees. They have some protection from the wind and an irrigation system for regular water. Their transpiration cooled, cleaned and humidified the air. They added much atmosphere with their twinkly electrical lights even when the trees were dormant. Like Souma said, though, the weight! Smaller, contained garden planters are always viable and they too, add atmosphere with their green leaves and exquisite flowers. Probably not really realistic for a totally integrated “green building”, however, no matter how lovely they may be.
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