Extensive Green Roof Maintenance
The shallower, extensive varieties of green roofs are usually designed to have relatively simple maintenance requirements. This is not to say that they can just be left, however. Extensive green roofs may require watering on a regular basis, as well as the elimination of undesirable flora (such as weeds) from the area of the roof and the gravel or shingle perimeter.
It will also be also necessary to check that the drainage system is clear of debris, usually at least twice a year.