Nodding Onion vs Early Blue Violet - TreeTime.ca

Nodding Onion vs Early Blue Violet

Viola adunca

Allium cernuum

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Early Blue Violet
Nodding Onion

Early Blue Violet is a low-growing native perennial wildflower valued for its striking early-spring blooms. The flowers range in color from vibrant blue to deep violet, often marked with pale highlights and fine white hairs. They provide an important early nectar source for pollinators and serve as a host plant for several fritillary butterfly species.

It spreads by both seed and rhizomes, gradually forming small colonies. Its dark green, heart-shaped leaves add ornamental appeal, and the plant shows some resistance to deer browsing. Early Blue Violet is well-suited to naturalization projects and pollinator-friendly gardens, and has also been used in coastal butterfly habitat restoration in the Pacific Northwest.

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.

Early Blue Violet Quick Facts

Nodding Onion Quick Facts

Zone: 2a
Zone: 3a
Height: 0.1 m (0.3 ft)
Height: 0.3 m (1.0 ft)
Spread: 0.2 m (0.5 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: fast
Growth rate: fast
Life span: short
Life span: short
Growth form: low growing, clump-forming
Growth form: upright to spreading, clump-forming
Spreading: seeds - medium, rhizomes - medium
Spreading: seeds - high
Maintenance: medium
Maintenance: medium

Toxicity: rhizomes, fruit, seed poisonous to humans

Toxicity: raw leaves and bulbs can be midly toxic
Foliage: smells of onion when crushed, edible
Flowers: purple to blue-violet
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, SK, MB, ON, QC, NS, NB, YT, NT
Native to: AB, BC, SK, ON
Other Names: dog violet, hookedspur violet, sand violet, western blue violet
Other Names: ladys leek, nodding wild onion