General Characteristics: Asiatic lilies are hybridized lilies which are famous for their vigor. An Asiatic lily is a lily in the genus Lilium. Plants in this genus are sometimes referred to as “true lilies,” reflecting the fact that they are botanically classified as lilies, rather than just being called “lilies” by people who are not knowledgeable about horticulture. True lilies are bulbs, and they have fleshy stems, blade-like leaves, and trumpet-shaped flowers. The Asiatic lily is among the easiest to grow. Given an area which gets sun for at least half the day and some well-drained soil, these lilies will flourish with minimal effort on the part of the gardener. They typically return in very thick clumps each year, requiring thinning every three to four years to break up the bulbs and spread them out so that they will not crowd each other in the soil.