Green Roof plant material grown from seeds
This method of a green roof is not normally used anymore because it takes the longest time to become established.
However, it is the most affordable.
If you are starting from seeds we recommend they be evenly spread, at a rate of 60 grams per m².
As with a lawn in the yard, a seeded green roof requires more care, including weeding, and additional watering. This added care means added costs, and it could take several years, before you would have a nice dense green roof.