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Consider the case of this San Francisco backyard: a sheer slope on the southeast face of Mount Davidson, where a concrete drainage trench carries winter's seasonal river and then runs dry for summer and fall. The trench cuts off houses from their gardens and limits human access to the yards uphill. At this particular house, the existing deck was built out to the edge of the trench, with no means of getting across.
Question: How to deal with this ugly yet necessary piece of engineering?
Answer: Add another level of deck to bridge the gap. Set the platform at an angle to diverge from the rectangular facade of the house, and to suggest triangular shapes in the landscape. Cantilever all four edges 24" over the beams, thus hiding the posts so the deck appears to float above the ground.
This deck, with bench and arbor, is both a place to inhabit and to pass through. We cut a path in switchbacks up the slope from the point of contact with the platform, removed all french broom, fennel, and ivy from the hill, and replanted with native pinegrass, junegrass, and needlegrass; a field of silver lupine and scattered Ceanothus to attract butterflies, especially the fabled Mission Blue; elderberries and manzanitas for bird-friendly flowers and berries; and more.
The marriage of living plants and cold steel ranks among the most enjoyable elements of practicing landscape design in the San Francisco Bay Area.
SCENARIO: Single-family residence on steep 2-acre property in Los Altos Hills, California. The lovely and level back patio was marred by the slope immediately above it: ugly bare dirt, too steep for traditional planting, and eroding at the base of the house's diagonal support beams. The situation called for a bold stroke of design creativity.
QUESTION: How to turn this liability -- a barren and degraded slope -- into a lush and attractive asset?