Dead head Dahlias as the flowers go over and make sure the taller varieties are staked. Feed with a high potash feed once a week from midsummer to early autumn. When the foliage has been damaged by the first frosts, cut back the stems to 15cms, brush off the soil and lift out of the pots. Place them upside down in a frost-free place to dry naturally. Pack them in boxes of compost or sand, store over winter in a well-ventilated, frost-free place. Water pots of lilies every day and apply a high-potash feed every 2 weeks. You may have to stake taller varieties in windy conditions.