In article ,
"Uncle Marvo" wrote:



Any ideas/tips/pointers/books/articles on the subject would be very welcome.


Planting Green Roofs and Living Walls
by Nigel Dunnett, Noel Kingsbury
http://www.amazon.co.uk/Planting-Gre.../dp/088192640X


Green Roof Plants: A Resource and Planting Guide
by Edmund C. Snodgrass, Lucie L. Snodgrass
http://www.amazon.co.uk/Green-Roof-P.../dp/0881927872

Green Roofs: Ecological Design And Construction
http://www.amazon.com/Green-Roofs-Ec...ction/dp/07643
21897

Should get you started.

I heard something on GQT on R4 on Sunday saying that sedum was
difficult to get, and all you got nowadays was some inferior variety.

This sounds badly scrambled. There are almost 300 sedum cultivars listed
in the RHS Plant finder. I would guess a lot of them are good for
green roofs. Which of them are best for the purpose, the books might
say.

Reginald Farrer (always good for a laugh...) was delightful on the genus.
"Sedum - This vast race as a whole, is curiously uninteresting: as is
felt even by catalogues, that do their best, yet cant say much, and take
refuge in an inextricable welter of synonyms and pseudonyms. Nearly all
Sedums are of easy culture in open poor places often far too easy of
cultivation, and yet more deplorably easy of propagation. The race is
far too large and dim for us here minutely to discriminate."
Not a promising start but he goes on to describe over sixteen pages
nearly 200 species in cultivation at the time (1919).
quoted from http://northants.bcss.org.uk/nl161/nl161odds.htm

You could always try the sedum society...
http://www.cactus-cacti.com/sedum/index.html