Three lavishly illustrated new titles reveal the rich diversity of contemporary landscape design. Separated into thematic chapters, The Private Oasis (Grayson, $50) features architecturally responsive projects by Edmund D. Hollander’s noted Manhattan-based firm, offering ideas for swimming pools, dining terraces, entry sequences, and other outdoor spaces. Mediterranean Landscape Design (Thames & Hudson, $60) presents work from throughout the region, whether a lushly layered property in the Tuscan countryside or a Zen-inspired plot on the French island of Corsica. And wall-climbing creations by botanist Patrick Blanc practically sprout from the pages of his updated monograph, The Vertical Garden (W. W. Norton, $65).