Hi everybody,
it seems that I take part to this discussion really late, but I might have very interesting technique for the green walls, probably the best at the market this time. This system comes from Sweden, used for example by Chelsea Flower Show by the booth “best of show” Ulf Nordjfell. You can find pics for example http://www.rosenbergwase.se/Chelsea%20sve/chelsea.htm
This system has developed Company called Veg Tech, have a look to they websites: http://www.vegtech.se/sv/veg-tech-bygg/products/fasadvegetation/veg-tech-wall-outdoors—vaxtvaggar/uid-177/categoryinformation.aspx
unluckily it is just in swedish or finnish, but if necessary, don’t hesitate to contact they office in Stockholm or Vislanda.
Because I’m preresentative for Veg Tech products in Finland I know also quite a lot about this module based system.
Regards,
Juha