Beautiful, colorful landscaping! The tall grass is purple fountain grass (Pennisteum sectaceum 'Rubrum'), available from bustaniplantfarm.com (image credit). Looks like coleus and purple heart, and maybe begonias?
Harpur Garden Images Ltd :: Marcus Harpur A Garden for First Touch at St George's Sloping garden of green foliage. A slope with dense planting of colourful purple blue perennials and grasses including salvia nemorosa. Corten steel step risers with gravel Silver-Gilt medal Design: Patrick Collins Sponsor: St George's Hospital and Medical School