It's not a truly valid question. it's about the conditions provided, not the plants.
"Living walls" usually consist of "mounted terrestrials", but the environment is modified to allow them to grow well.
ANY request for information about the "best/easiest/worst/hardest" ANYTHING in orchid culture is a bad question. What is good for you, might be bad for me (or vice versa), because our growing conditions and cultural techniques differ.
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