Well, it depends on where you live – the climate and weather – and also the kind of green roof you have/want, such as intensive or extensive. But the best kinds are plant are hardy, so they can survive in rooftop conditions. This site: (http://www.apexgreenroofs.com/green-roof-plants.html) list some good rooftop plants, including sedum roseum and yarrow.
It really depends on the climate the roof is subjected to and whether the roof is irrigated or not, among other considerations. All green roofs aren’t equal. In northern climates such as Michigan’s or Illinois’s, on roofs that aren’t irrigated, ideal plants are those most tolerant to heat and cold, and are drought resistant, among other climate-specific qualities. According to a Michigan State University study, plants that fit the above characteristics are found in the species Sedum.
Since the climate of your area is very important for what type of plants you will have on your green roofs, I have attached a project map of Emory Knolls Farms’ locations. Emory Knolls is a green roof planner and plant provider, with projects all over the eastern half of the US.
Like everyone else said, climate influences the answer to this question, but I’m going to give you some general plants that I think are pretty and are good for green roofs. I’d go with hardy ground covers, like cerastium tomentosum, or “snow in summer” -a silvery, sturdy foliage. Sedum album is considered a staple green roof plant for its hardiness and beauty, as well as phedimus takesimensis or “golden carpet.” I like sedum ellacombianum as well, for its lush, light green color, which contrasts with a lot of typical rooftop plants (which tend to be darker green). Check out greenroofplants.com for lists of plants that will do well on a green roof.
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