Lilies are bulbous plants of Asian and European origin, which produce large flowers during the summer months. The lily bulbs are placed in the ground, or in pots, where they can be left undisturbed during the winter, since they enter into full dormancy, and thus tolerate frost well. They prefer a good rich, soft and very well drained soil, with plenty of humus. The beds for lilies must be very bright, but possibly not too sunny: 2 to 4 hours of sunshine every day can be more than enough. To obtain well-developed plants, place the bulb with the flat side down, and the tip directed upwards, burying it to about one and half times its diameter. The deeper the bulb is planted, the longer it will take to produce foliage, but at the same time it will be better protected from the cold during winter. Watering should be regular, from April to September, in order to keep the soil cool, but not wet. You should water when you feel that the soil is dry.