Depending on who you talk to, green roofs have over a dozen benefits. One of the lesser known and investigated ones is for horticultural therapy. I haven't seen that many studies on how green roofs, in particular, affect one's health. Theodore Osmundson, who passed away in 2009, was one of the first people to consider this benefit (among others for green roofs) with a 1999 paper entitled "Roof gardens: history, design, and construction". More recently it has received a couple of mentions in Green Roofs for Healthy Cities newsletter in 2003 and 2011. I hope others pursue further research investigating the effect green infrastructure, in particular green roofs and green walls have on human beings, considering the proliferation in North America and around the world.
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