Fritillaria thunbergii aka Zhejiang Fritillary

Fritillaria thunbergii is a bulbous perennial in the lily family. Gardeners know it as Thunberg fritillary or Zhe Bei Mu. Sources differ on its native range. Kew and the RHS place it in Central Asia. Plants For A Future lists parts of eastern China. That source records it in bamboo woods and damp shade. These habitats extend from near sea level into low hills.

The plant grows upright and loses its leaves each year. The RHS describes plants about 2 feet [0.6 metres] tall. Its garden size range reaches 3.3 feet [1 metre]. Spread reaches about 0.3 feet [0.1 metres]. Narrow leaves grow in whorls around the stems. The upper leaves form tendrils. The slim shape suits small spaces among other plants. Plants take two to five years to reach full size.

The flowers hang down and have a bell shape. The RHS describes about four flowers on a plant. Each bloom measures about 0.08 feet [0.025 metres] long. Their pale cream-yellow petals bear purple-brown spots or squares. Chicago Botanic Garden lists the flower colour as white. The RHS places flowering in spring. Chicago records bloom periods spanning March through June. These accounts give a broader flowering window than spring alone.

Grow this fritillary in sun or partial shade. Choose a sheltered spot with soil that drains well. The RHS recommends soil with a moderate level of fertility. Chalk, loam and sand can all suit it. It accepts acid, neutral and alkaline soil. Give moderate water, but avoid wet soil during dormancy. The RHS rates its hardiness H4. Chicago lists USDA zones 6–8. Suitable settings include rock gardens, pots and woodland edges. It also serves as an understory plant.

No pruning is needed. Sow seeds in pots in autumn in a cold frame. Winter cold helps them germinate the next spring. Divide bulb offsets in late summer. Slugs and lily beetles may attack the plants. The RHS reports few disease problems. Plants For A Future records cooked bulbs, young plants and buds as food. It also lists traditional medicinal uses for the bulbs, including cough remedies. These records do not establish safe use. The RHS warns that the bulbs harm people and pets. Do not eat ornamental bulbs, and wear gloves when handling them.