Formal English gardens are green, intricate and tidy. Their manicured hedges and lovely pathways evoke images of Alice scampering through the mazes of Wonderland. The focus of this 25-foot-square courtyard in San Francisco is a knot garden comprised of a boxwood hedge framed by thirteen Pittosporum undulatum trees. Usually grown as a hedge, this tree is native to Tasmania and Queensland, Australia. Its fragrant flowers give the plant its common name, the Mock Orange.