To read more about green roofs, read our article "Green Roofs."
Most information on green roofs is aimed at big buildings, but a few solid residential resources exist.
Books: First grab Small Green Roofs: Low-Tech Options for Greener Living by Nigel Dunnett, Dusty Gedge, John Little, and Ed Snodgrass, mostly for its overview and achievable examples. Along with Linda McIntyre, Snodgrass also contributed a useful chapter on green roofs to Thomas Christopher’s splendid The New American Landscape.
Left: In Virginia, Norfolk Botanical Garden’s green roof uses sedum, delosperma, and sempervivum.