I dabbled with it back in 2006 for a rhs chelsea show garden, creating my vertical living art installations, but we have since played with the ideas.
Here's an idea we carried out back in a tiny courtyard garden back in 2007, using offcuts of paving, to create the crevices in which I planted a mixture of Sempervivums, requiring a teaspoon of water, these plants can thrive in this sunny location and are incredibly low maintenance.
Here mixed with Rudbeckia deamii, Achillea, Verbena, Anemanthele (although be careful with this grass, it can self seed anywhere, but easy to pull up unwanted seedlings) and topiary.
This vertical idea creates a great, original, textural focal point that breaks up the white rendered walls that enclose this tiny courtyard.
designed and planted by greencube