as a cubic meter of soil weighs 1.6 tonnes an average shed roof of size 3mx2m will have a load of approx 1.45tonnes will the shed roof take the strain? It will be more in the autumn and Winter when the soil is wetter.
The shed roof does not have to be made of soil, have you ever tried to grow cress on blotting paper or felt or a paper towel? the principle is the same on a green roof - unless you are thinking of growing potatoes or an oak.
Just a note to consider, my neighbour has self-seeded sedum on her wall. It spreads into my garden every year, hundreds of little plants in my vegetable patch. I love to see it on her wall but the weeding drives me crazy. The same thing applies to grasses, tolerant neighbours are a must if you chose some self-seeding plants.
House leeks will grow on a roof and there is a lot of choice of these plants ,put them on and ignore them .
you don't really need much of a base.
Villagers in the olden times would plant these on their roofs , with folklore, comes a belief that pan tiled roofs planted with house leeks would ward off lightning.
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Just a note to consider, my neighbour has self-seeded sedum on her wall. It spreads into my garden every year, hundreds of little plants in my vegetable patch. I love to see it on her wall but the weeding drives me crazy. The same thing applies to grasses, tolerant neighbours are a must if you chose some self-seeding plants.
http://www.secrets-of-shed-building.com/green-roof-dilemma.html is a current thread on shed building monthly, they are looking for green roof examples.
House leeks will grow on a roof and there is a lot of choice of these plants ,put them on and ignore them .
you don't really need much of a base.
Villagers in the olden times would plant these on their roofs , with folklore, comes a belief that pan tiled roofs planted with house leeks would ward off lightning.