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/Lavender Flower,
Red Flower
Uses
Beds and Borders,
Naturalizing
Style
Rock Garden
Seasonal Interest
Summer Interest
Tolerance
Deer Tolerant

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