Because of their vigorous growth, people all over the world also call this variety of lilies tree lilies or lily trees. The flowers of OT lilies have vibrant colours and are extra-large, wide-open, and mostly cup-shaped. The petals are thick and waxy and have a firm texture. Powerful, vigorous growth, 1.2–1.8 (2.5) m tall. All varieties are fragrant. Usually 20–30 flowers per stem. The stems are very strong. Lilies are best suited for sunny or slightly shady areas, sheltered from strong winds and night frosts. Lilies do not tolerate hot and dry areas that are directly exposed to the sun. In these kinds of places, they bloom for a shorter time and the colour of their flowers fades. Lillies are also not suited for damp habitats, where they are susceptible to disease. A perfect location would be an area that has light shade around midday. The flowers appear brighter in semi-shaded areas. Lilies should not grow under large trees because air does not circulate there, and the roots of trees absorb nutrients and water from the soil very well. Although the above-ground parts of lilies prefer a warm and wind-free location, they should not be planted along walls and hedges, where they may overheat. The bulbs and roots of lilies require a much cooler environment compared to the above-ground part. The soil temperature can be regulated by using mulch. Lilies may be surrounded by a layer of compost or neutralised peat. Lily bulbs and roots are very sensitive to lack of air and also excess moisture. They cannot tolerate standing water on the ground. The soil should be reasonably moist and well-drained. Heavy clay soils, which tend to be too moist and poorly aerated, are also not suitable for lilies. Drainage is needed for such soils to improve the soil structure. If the level of groundwater is high, lilies should be grown in raised planters.