In order to garden successfully with plants growing on a wall, it's important to recognize the difference from traditional gardening. Succulent plants are often found growing on cliffs in the crevices of rocks or on the cliff edges, clinging to what soil they can find. This ability to eke out a living in little soil makes them pretty good candidates for vertical gardening. Robin Stockwell, "The Succulent Guy," gives a step-by-step guide on living picture frames.

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