Nodding Onion vs Lewis Mock Orange - TreeTime.ca

Nodding Onion vs Lewis Mock Orange

Philadelphus lewisii

Allium cernuum

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Lewis Mock Orange
Nodding Onion

Lewis Mock Orange is a flowering ornamental shrub that produces an abundance of white, fragrant blooms. The flowers have a sweet scent similar to orange blossoms, with a hint of pineapple. They bloom for several weeks from late spring to early summer, attracting pollinators and other beneficial insects.

Native to North America, Lewis Mock Orange is found from the southernmost portions of Alberta and British Columbia, and south into the northwestern United States. It makes an attractive shrub and can be used in hedgerows, pollinator gardens, and naturalization projects. Blooms occur on the previous year’s wood, so it is recommended to prune after it has finished flowering.

Nodding Onion is a native perennial wildflower known for its nodding clusters of flowers that range in color from white to pink to purple. The lightly scented blooms provide pollen and nectar for pollinators, especially bees, which can collect while hanging upside down, a capability most other insects lack.

The narrow, grass-like leaves of the Nodding Onion can be used as a seasoning in cooked dishes, though bulbs and raw leaves should not be eaten in large quantities. All parts of the plant have an onion-like aroma when bruised, which helps deter deer and rabbits. They can self-seed readily, so removing spent blooms helps manage their spread. Tolerant of a range of soils, including alkaline, it is well-suited for a variety of plantings, including pollinator gardens and naturalization projects.

Lewis Mock Orange Quick Facts

Nodding Onion Quick Facts

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Zone: 4a
Zone: 3a
Height: 3 m (10 ft)
Height: 0.3 m (1.0 ft)
Spread: 2.4 m (8 ft)
Spread: 0.2 m (0.5 ft)
Light: partial shade, full sun
Light: partial shade, full sun
Moisture: dry, normal
Moisture: dry, normal
Growth rate: medium
Growth rate: fast
Life span: medium
Life span: short
Growth form: upright to arching, multi-stemmed
Growth form: upright to spreading, clump-forming
Spreading: suckering - medium, seeds - low
Spreading: seeds - high
Maintenance: medium


Toxicity: raw leaves and bulbs can be midly toxic
Foliage: smells of onion when crushed, edible
Flowers: fragrant, white
Flowers: white, pink, or purple nodding clusters
Bloom time: mid spring to early summer
Bloom time: late spring to summer
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Native to: AB, BC
Native to: AB, BC, SK, ON
Other Names: california mock orange, lewis mockorange, western mock orange, western syringa, wild mock orange
Other Names: ladys leek, nodding wild onion