Plant · GBIF taxon 2856745
nodding onion
Allium cernuumAlso known as Lady's Leek, Wild Onion
Nodding onion derives its name from the distinctive crook in the flowering stalk, which holds clusters of bell-shaped pink or white blossoms facing downwards to shelter nectar from rain. Narrow, strap-like leaves emerge from small elongated bulbs in early spring, releasing a sharp sulfurous scent when bruised that deters browsing herbivores. Long-tongued native bees and butterflies rely heavily on these midsummer floral clusters across dry prairies, bluffs, and open rocky woodlands.
PerennialWildflowerDrought-Tolerant
—observations
—countries
—peak records
Least ConcernConservation statusIUCN Red List categoriesLCNTVUENCREWEXLeast ConcernRed List categories, explained →
Diet & prey
- Sunlight
- Water
- Soil nutrients
Predators
- Voles
- Groundhogs
- Onion maggot larvae
ThreatsHabitat loss, invasive plant competition, and heavy grazing
HabitatsRocky slopes, glades, prairies, bluffs, and dry open woods
Life spanPerennial (typically 5–10+ years)
Size / weightNot available
Classification
- OrderAsparagales
- FamilyAmaryllidaceae
- GenusAllium
- SpeciesAllium cernuum
Range data is not available yet.
Interaction riskHigh
- Low
- Moderate
- High
- Very high
- Why interaction risk is high
- Toxic to dogs and cats if ingested; never consume wild bulbs due to lethal look-alikes like death camas.
- Why it is dangerous
- Contains sulfoxides and thiosulfates that cause oxidative damage to red blood cells and hemolytic anemia in dogs and cats.
- How to recognize a risky encounter
- Recognized by drooping umbels of pale pink to white bell-like flowers atop leafless stems alongside grass-like basal foliage.
- What to do
- Prevent household pets from chewing foliage or digging bulbs, and avoid harvesting wild plants to prevent confusion with death camas.
Responsible observation
- Garden cultivation: Grow in sunny rock gardens or well-drained borders to attract native pollinators.
- Safe identification: Check for the distinctive downward curve in the stem just below the bloom cluster.
- Wildlife observation: Watch the blossoms in midsummer to spot visiting sweat bees and bumblebees.
Toxic Look-alike (c) David Anderson, some rights reserved (CC BY), uploaded by David Anderson · cc-by
Pollinator (c) crseaquist, some rights reserved (CC BY), uploaded by crseaquist · cc-by
Close Relative (c) Douglas Goldman, some rights reserved (CC BY-SA), uploaded by Douglas Goldman · cc-by-sa
Close Relative (c) USFWS Mountain-Prairie, some rights reserved (CC BY) · cc-by
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