Hallo,
so sehe ich das jetzt so richtig das ihr (ich nehme das was kommt 
) Euch auf
roof:material=green_roof
geeinigt habt?
Ich würde dann meine zwischenzeitlichen Tags roof:material= roof_greening dahingehend abändern.
Gruß
Danfost
Edit:
roof_material hat hier niemand vorgeschlagen, roof:material hingegen schon.
Upps, sorry
werde es oben Ändern 
As a matter of interest how would this roof be described? Although the description calls it a green roof it has none of the infrastructure that I associate with such a roof (described by @streckenkundler above), so I might tag it roof:material=plants, green_roof=no
.jpg)
Enviable Outhouse (geograph 6660516)
Bob Harvey / Enviable Outhouse
Well, the question is if we also want to tag vegetation on roofs with green_roof=yes, if this vegetation has not been planted on purpose.
In your example, I’d say roof:material=roof_tiles is correct, but I don’t know how to tag the vegetation.
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roof:material=green_roof_tiles …??.. 