Canna Lilies - Canna cannova - Growing Canna lilies in your garden is an easy way to create instant flamboyant tropical flair. Striking and vibrant large showy flowers in a dazzling array of colours are borne on tall stalks poking out of the large paddle-like leaves that come in a range of greens, blue-greens and bronzes or variegated/striped patterns. Watching canna leaves shoot up and then unfurl over a few days is an impressive sight. Canna flowers come in shades and combinations of yellow, orange, red and pink. Most cannas grow up to six feet tall and flower from early summer right through to autumn. Canna x generalis – Dwarf Canna Lilies These are a compact, dwarf variety of Cannas.