Japanese onion

Allium thunbergii

Photo/Illustration: 
Chris Curless
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Japanese onion (Allium thunbergii)
AL-ee-um thun-BER-jee-eye
Genus:  Allium
This is the last of the ornamental onions to flower, when mop-like heads of rose-purple flowers appear with orange anthers. The flowers are impervious to frost or snow. Superior cultivars include ‘Ozawa’, with larger purple flower heads than the species. A white-flowered form known as A. thunbergii ‘Alba’ is a splendid plant, with cup-shaped florets sporting white stamens, yellow anthers, and green centers.
Care:  Provide full sun to part shade and average, well-drained soil.
Propagation:  Sow seed in spring in containers or in situ. Divide clump-forming  plants in spring.
Problems:  Bulb rot in damp conditions. Onion fly and thrips.

Overview

Height
6 in. to 12 in.
Light
Full Sun to Part Shade
Moisture
Medium Moisture
Maintenance
Low
Characteristics
Attracts Butterflies,
Attracts Hummingbirds,
Fragrant Foliage
Bloom Time
Fall,
Late Summer,
Summer
Flower Color
Purple,
Red
Uses
Beds and Borders,
Naturalizing
Style
Rock Garden
Seasonal Interest
Summer Interest
Tolerance
Deer Tolerant

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