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Expensive, proprietary wall and roof systems are nice because the engineering and the functionality have (hopefully) been worked out. The downside is that they are expensive and proprietary.
I like the idea of building something new with materials that are easy to find and that are relatively inexpensive. Gathering some left over wood polymer decking, 1/4" metal bed edging, weed fabric and netafim irrigation parts, I built a 3' x 3' "green wall module", mounted it to our shed and watched to see what would happen.
The good news is that the plants are thriving and it looks pretty cool. I didn't anticipate the amount of water drainage, however, and future green walls will have to be constructed with a mind to recirculate the water and pay closer to attention to water proofing the module.
NEXT: Green wall 2.0