Oriental Lily

Oriental lilies are the aristocrats of the lily world, producing enormous, outward-facing or pendulous flowers with an intoxicating, heady fragrance that perfumes the entire garden. Blooming in mid to late summer (July-August) after Asiatic lilies have finished, they extend the lily season with flowers up to 25cm across in white, pink, crimson, and bicolor patterns, often with dramatic spots and papillae.

Plant bulbs 15-20cm deep in spring or autumn in well-drained, humus-rich, acidic soil (pH 5.5-6.5). Oriental lilies are less tolerant of alkaline conditions than other lily groups and may develop chlorosis (yellow leaves) in limy soil. In hot climates, provide afternoon shade to prevent flower bleaching and extend bloom life. Cool, moist roots are essential—mulch heavily.

Stake tall varieties before they flower, as the enormous blooms are heavy. Remove developing seed pods after flowering to conserve energy. Oriental lilies are somewhat less vigorous than Asiatics and may need replacement every 3-5 years, though in ideal conditions they can persist and multiply well.

Oriental Lilies trace their origins to the mountainous regions of Japan, where their parent species Lilium auratum (the gold-banded lily) and Lilium speciosum (the Japanese lily) grow wild on volcanic slopes and forest margins. Lilium auratum was first introduced to Western horticulture in 1862 when specimens were shipped from Yokohama to London, where they caused a sensation at the Royal Horticultural Society. The species proved difficult to cultivate in European gardens, being susceptible to viral diseases and intolerant of alkaline soils. Lilium speciosum, introduced somewhat earlier from Japan and China, proved hardier but still challenging. Systematic hybridization between these and related species began in earnest in the 1950s, led by breeders in Oregon, California, the Netherlands, and New Zealand. The breakthrough came when Jan de Graaff's Oregon Bulb Farms and later Leslie Woodriff developed crosses that combined the spectacular flower size and fragrance of the Japanese species with improved garden vigor and disease resistance. Woodriff's creation of the Stargazer lily in 1978 revolutionized the industry — it was the first upward-facing Oriental hybrid, making it ideal for both garden display and the cut flower trade. Today, the Netherlands is the world's largest producer of Oriental Lily bulbs, with Dutch growers exporting hundreds of millions of bulbs annually to markets worldwide. Modern breeding programs continue to expand the range of colors, improve virus tolerance through tissue culture propagation, and develop compact cultivars suited to container growing. The OT (Orienpet) hybrids, crossing Orientals with trumpet lilies, have further extended the range with even larger flowers and greater heat tolerance.

Oriental lilies require acidic, well-drained, humus-rich soil with a pH of 5.5-6.5. They struggle in alkaline conditions—acidify with sulfur or use ericaceous compost in containers. Incorporate plenty of leaf mold and composted bark. Feed in spring with ericaceous fertilizer and again with high-potassium feed as buds develop. Heavy mulching with acidic materials (pine bark, leaf mold) is essential.

Oriental lilies are premium cut flowers. Cut when the first bud in the cluster is showing color and beginning to open. The remaining buds will open over 7-10 days, providing an extended display. Remove orange pollen anthers immediately to prevent staining. One stem of an oriental lily can perfume an entire room. Leave at least one-third of the stem on the plant.

Oriental lily bulbs are best left in the ground in well-drained acidic soil. If lifting, handle carefully—they have no protective papery skin. Store briefly in barely damp peat or sphagnum moss in a cool place. Never allow bulbs to dry out. Flowers can be preserved in silica gel for dried arrangements—their large size makes impressive preserved specimens.