There are numerous plants that have lily in their name - lily of the valley, plantain lily, arum lily, canna lily - to name but a few. But the true lilies, with their large trumpets producing a kaleidoscope of colour in summer often with spicy and exotic scents, are species and vareties of Lilium. Being a bulb, true lilies are easy to grow and reliably flower year after year for many years with very little attention.