Narrowleaf onion (Allium amplectens)

Narrowleaf onion

Narrowleaf onion (*Allium amplectens*) is a wild onion species, native to western North America, from British Columbia in Canada to Oregon, Washington, and California in the U.S. It can be found in forests, with a preference for clay and serpentine soils. The bulb is perennial and regrows year after year. The flower head is attractive in pale magenta hues, so narrowleaf onion is sometimes grown as an ornamental.

Scientific classification

Species

Narrowleaf onion (Allium amplectens)

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Herb

Plant Type

Summer

Bloom Time

15 cm to 30 cm

Plant Height

5 cm

Spread

Green, Gray

Leaf Color

2.5 cm to 5 cm

Flower Size

White

Flower Color

Green, Yellow

Stem Color

Deciduous

Leaf type

Images of Narrowleaf onion

Cultivars

There are several recognized cultivars of Narrowleaf onion, including the following common varieties :

Narrowleaf onion 'Graceful Beauty'

Care Guide for Narrowleaf onion

Every week

Water

Full sun

Sunlight

10 - 35 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Narrowleaf onion prefers well-drained soil and thrives on a weekly watering schedule, reflecting its native moisture cycles. It can endure short droughts due to its water storage capacity. During active growth seasons, increase watering to support flowering, which relies on sufficient hydration.

Fertilize: Narrowleaf onion requires balanced fertilizer during the growing season for optimum growth and flowering. In early spring, high phosphorus promotes bulb health. Apply monthly at recommended doses, adjusting for dormancy and growth stages. Follow label instructions for safe use, suitable for all gardening levels.

Pruning: Narrowleaf onion features slender foliage and attractive flower umbels. Prune from early to late spring, focusing on damaged leaves to improve air circulation and prevent disease. This essential practice promotes vibrant blooms and overall plant health. Always use clean, sharp tools for pruning.

Propagation: Narrowleaf onion is propagated by division, carefully separating bulbs after foliage dies back. Replant at three times the bulb's height in well-draining soil with ample sunlight. Consistent moisture during the growing season promotes healthy growth.

Repotting: Narrowleaf onion requires excellent drainage in pots to thrive, ensuring that excess water does not accumulate and harm the plant's roots.

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