Partly because sedums require little or no fertilizer or other maintenance species that form low mats are used for green roofs.
Sedum roof fertilizer.
Sedum nutrition is an organic fertilizer that meets all needs of a sedum roof.
Apart from the economic incentive for selecting a diverse pallet of sedums for the roof it also has ecological effects as a resilient roof will require less fertilizer applied as well as fewer pesticides.
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Check for bare areas.
Never exceed the manufacturers recommended rate.
Fertilizing once or twice a year spring and or early fall with an organic rich fertilizer is usually enough.
Sedums are fairly light feeders.
It provides a strong root system for the sedum plants and thus increases plant health.
Such living roofs can be found on industrial buildings as well as.
Too much nitrogen will encourage weeds to grow on the roof and will also kill the sedum plants.
Increasing the application rate of organic fertilizers to compensate for their lack of readily utilizable nutrients may be effective at improving sedum green roof aesthetics however there may be associated risks as far as nutrients in runoff.
Cut upright types to the ground after fall frost or before new growth begins in spring.