Homes with grass Roofs
The Unique Property Site
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It's great for insulation, and it helps integrate the property into the landscape, and it protects the roof itself.
The roof needs to be covered in felt and a thick PVC lining. This is then covered with four to six inches of soil. This is heavy, so you do need a strong roof support in the first place.
The earth is then planted with grass. You can let wild flowers grow in it, but obviously you must root out any shrub or tree seedlings that take root in the turf.
You can lightly mow the grass once or twice a year.
For more ideas of this sort head for the Centre for Alternative Technology in Machynlleth, Wales.