Ideal irises
■ Early-rising snowdrops are quickly followed by irises, crocuses and daffodils, and eventually tulips, alliums and bluebells. These are bulbs that need to be planted in autumn – unless you buy potted bulbs in bud to create a ready-made spring garden.
■ For a final flurry in January, plant the Algerian iris, Iris unguicularis, which will brave the weather and thrive in poor soil. Iris reticulata is another winter gem. The blooms are mostly shades of blue, with white, violet-margined blades to the falls. Iris histrio is a particular favourite,
decorated with yellow and dots of black. Dainty Iris danfordiae is one of the most reliable to welcome in the New Year with its bright yellow blooms.