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Corkscrew Onion

Allium senescens

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Corkscrew Onion (Allium senescens) at Landsburg Landscape Nursery

Allium senescens in bloom

Allium senescens in bloom

(Photo courtesy of NetPS Plant Finder)

Plant Height:  12 inches

Flower Height:  24 inches

Spread:  12 inches

Sunlight:  full sun 

Hardiness Zone:  2

Other Names:  Flowering Onion

Ornamental Features

Corkscrew Onion has masses of beautiful balls of lightly-scented lavender flowers at the ends of the stems from late spring to early summer, which are most effective when planted in groupings. Its sword-like leaves remain green in color throughout the season. The fruit is not ornamentally significant.

Landscape Attributes

Corkscrew Onion is an open herbaceous perennial with tall flower stalks held atop a low mound of foliage. Its medium texture blends into the garden, but can always be balanced by a couple of finer or coarser plants for an effective composition.

This is a relatively low maintenance plant, and should only be pruned after flowering to avoid removing any of the current season's flowers. It is a good choice for attracting butterflies to your yard, but is not particularly attractive to deer who tend to leave it alone in favor of tastier treats. It has no significant negative characteristics.

Corkscrew Onion is recommended for the following landscape applications;

  • General Garden Use

Planting & Growing

Corkscrew Onion will grow to be about 12 inches tall at maturity extending to 24 inches tall with the flowers, with a spread of 12 inches. It grows at a medium rate, and under ideal conditions can be expected to live for approximately 5 years. As this plant tends to go dormant in summer, it is best interplanted with late-season bloomers to hide the dying foliage.

This plant should only be grown in full sunlight. It does best in average to evenly moist conditions, but will not tolerate standing water. It is not particular as to soil type or pH, and is able to handle environmental salt. It is highly tolerant of urban pollution and will even thrive in inner city environments. This species is not originally from North America. It can be propagated by multiplication of the underground bulbs.

 
 
Hardiness Zone Plant Height Minimum Sunlight
Characteristics
Garden 
Applications
Flowers  Plant Form  Attracts Wildlife 
Ornamental Features