There’s everything to like about Pretoria canna. First, there’s the fresh orange of the flowers with their red throats, deigned to attract bees and hummingbirds (and, in the tropics, bats). Then there’s the foliage – a fresh light green, with finely drawn yellow striations. Cannas are native to Central and South America and they’re one of the oldest domesticated plants in the world, going back thousands of years. Today, they’re popular around the world and grown as annuals even above the Arctic Circle where they have short summers but very long summer days.