A large black-stemmed Phylostachys nigra offers some drama and height to the back terrace, without taking up much space.

Using shiny black planters to compliment the architecture, a simple palette of greens and dark red combines airy Stipa tenuissima and Cosmos atrosanguineus (chocolate Cosmos) to bring lots of movement to the 3rd floor roof terrace, along with sturdy pompoms of sempervivum which will flower feely in...

Sempervivum flowers.

Cosmos atrosanguineus 'Chocolate'