屋顶花园：草本层次与城市天际线

Design a hotel roof garden in the manner of Piet Oudolf, planted as a naturalistic meadow above the city. Fill broad organic beds with an intermingled matrix of perennials and ornamental grasses at varying heights — tall calamagrostis and molinia, mid-height echinacea and sanguisorba, low sedums and geraniums — chosen for structure and seed head rather than flower colour, in muted russet, straw, bronze and soft mauve. Cut a narrow gravel path curving through the planting so guests walk enclosed by it rather than looking at it from outside. Keep the hard landscape minimal: one long corten steel edge, a few simple timber benches placed within the planting. Let the city skyline read above the grasses as a hard backdrop to the soft foreground. Add two or three multi-stem trees rising above the perennials. Show late summer going into autumn, with low evening backlight catching the seed heads and grasses glowing. Photorealistic, naturalistic, textural and atmospheric, eye-level view along the path.