A lot of people are attracted to the idea of a green roof due to its appearance. There are a lot of reasons besides this why people might want to have a green roof, such as the benefits to the environment, but ultimately it is because of its appearance.
If these people then go on to have such a roof installed on their home, they will quickly discover that these roofs aren’t very pretty all year round. During spring and summer time, they look pretty good, but during winter and autumn the Sedum browns and starts to look pretty terrible.
Overcoming this issue can be pretty difficult, and ultimately comes down to your selection of plants. The temptation is to use purely wildflowers, but if you add in a mixture of other plants which stay green all year round, your roof will look better all year round too.