Sedums are the lightest option for a green roof but you have to pick your species and substrate carefully. Take a look at this thread to see just how little some of them need.
This was my previous green roof experiment. I'd love to have a larger scale project to try now though. Sedums are great in their place but I'd like to do a full habitat roof now with varying soil levels and more insect habitat like the perimeter mini-gabion type edging and shallow water areas.
If you can keep your head, while those around you are losing theirs, you may not have grasped the seriousness of the situation.
I've got a brown roof experiment going on. About about 3 inches of gritty soil and just leave it to see what comes. So far it's just the usual pioneer species - ox eye daisies, some little geranium things, wild chamomile, catsear and couch grass. There is a sedum that I have put in in a few places (just shoved any broken off leaves into the soil - most will take). Like the other wild parts of my garden, each year a few new things appear.
Gardening on the edge of Exmoor, in Devon
“It's still magic even if you know how it's done.”
There's a house a couple of miles from me which was built on a rather inhospitable corner site - a bit of an odd location, and there's no proper garden, but I watched it with interest as it gradually appeared, because it was on my way to work. The house itself is basically 'round', and very contemporary, but it has a large green roof. Certainly draws attention My little bird cage roofs are just grit, with the only soil being the stuff that was already attached to the little plants when I put them in.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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“It's still magic even if you know how it's done.”
My little bird cage roofs are just grit, with the only soil being the stuff that was already attached to the little plants when I put them in.
I live in west central Scotland - not where that photo is...