Fritillaria imperialis aka Crown Imperial

Fritillaria imperialis, or crown imperial, belongs to the lily family. This perennial grows from a bulb and comes from western Asia. Its native range runs from central and southeastern Turkey to the western Himalaya. Wild plants grow on rocky slopes, cliffs, and among scrub. They also grow in rich soil beside rocks and in gullies. People have introduced it to Austria and Bulgaria.

Garden plants often reach 3–4 feet [0.9–1.2 metres] tall. The RHS gives an upper height of 4.9 feet [1.5 metres]. Plants spread about 1–1.6 feet [0.3–0.5 metres]. Each bulb sends up a strong, straight, green stem. Glossy green leaves grow in rings around its lower half. These lance-shaped leaves have wavy edges and no hairs. They reach up to 0.5 feet [0.15 metres] long. The plant grows slowly and loses its leaves by early summer.

The flowers hang in a cluster called an umbel. A tuft of leafy bracts sits above them like a crown. The bell-shaped blooms may be orange, red, or yellow. Flowering runs from April into June, with timing varying between sources. Both flowers and leaves have a scent. Some people compare the smell to garlic or a fox. The tall stems suit the back of a flower border. Gardeners also use this bulb in groups, pots, and rock gardens. It fits cottage gardens and informal beds.

Give crown imperial fertile soil that drains well. It grows in sun and can take partial shade. Sources list clay, loam, sand, and chalk as suitable soils. It accepts acid, neutral, or alkaline soil. Water needs are moderate, though settled plants can cope with drought. Cold hardiness spans USDA zones 5–8 and RHS rating H7. Handle the brittle bulbs with care and avoid needless disturbance. Water trapped in the stem hollow can cause bulb rot. No pruning is needed. Seeds need winter cold before they sprout in spring. Offsets can be divided in late summer.

Slugs and lily beetles may damage plants. Leaf spot, rust, and mosaic virus are also reported. The RHS describes it as largely free from disease. Deer, rabbits, and black walnut are listed among its tolerances. Raw bulbs and seeds are poisonous; the bulbs contain toxic alkaloids. Some sources report cooked bulbs as food and a minor starch source. The RHS advises against eating them and warns about pets. Historical medicinal uses do not remove this risk.