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Nodding onion

Allium cernuum · Amaryllidaceae · all Allium records

Your local evidence lens

Separate evidence questions, never one approval badge

Set a ZIP to compare this record with state distribution, native range, USDA hardiness, and invasive records.

A genus split is not a placement verdict. Set a ZIP to read the local documented split.

1. Fire evidence and conditions

Fire evidence
Fire-resistant — location does not change the cited classification.
Fire-performance conditions
No test or rating condition is normalized.
Fire ecology context
No section-reviewed fire-ecology context is normalized.
Placement evidence
5 source placement records; source schemes remain separate.
Evidence regions
British Columbia; Colorado / Rocky Mountain Front Range; Fremont County, Wyoming; New Mexico; OR/WA/ID; Pacific Northwest (Oregon / Washington / Idaho); southern Idaho / Intermountain
Maintenance
No sourced horticultural maintenance assertion is normalized; fire-test conditions do not supply maintenance advice.
Typed publication scope: 5 scopes across 5 cited fire sources
  • Ignition-Resistant Landscape Plants (Fact Sheet 6.305) · Official scoped edition
    • CO; partial normalized coverage · 2025-07-01

      Colorado State University Extension and the Colorado State Forest Service publish Fact Sheet 6.305 for Colorado's WUI and varied ecosystems. FireApproved exposes all 114 exact source owners at Colorado publication scope while retaining score, elevation, water, and Idaho-carrier lineage. Publication scope is not suitability for every Colorado site or zone.

  • Fremont County Firewise Plant List · Official scoped edition
    • Fremont County (WY footprint); partial normalized coverage · 2011-02-25

      The source identifies itself as the Fremont County Firewise Plant List. FireApproved publishes its 92 exact source owners as Fremont County regional context. No methodology, current county endorsement, statewide Wyoming scope, or site-specific suitability is inferred.

  • Fire Resistance of Plants Master Database · Official scoped edition
    • Southern Idaho (ID footprint); partial normalized coverage · 2013-11-08

      The official database labels itself "For Southern Idaho" and describes Idaho residents at the urban-rangeland interface. FireApproved publishes 419 existing plant owners that cite its scored rows. This bounded Southern Idaho scope is regional context, not statewide coverage or a conclusion that the score transfers unchanged to every Idaho site.

  • FireWise Plant List for New Mexico · Official scoped edition
    • NM; partial normalized coverage · 2003-10-08

      New Mexico Forestry Division publishes this as its FireWise Plant List for New Mexico. FireApproved accounts for all 140 printed rows and publishes 95 exact same-rank owners already represented in the directory; 29 exact taxa without an existing record, 14 unresolved spellings or higher-rank matches, one compound taxon cell, and one species row whose only apparent owner has an infraspecific printed identity remain held. Every published row retains the source's Y, N, ?, or blank elevation cells. Publication scope does not erase those elevation limits or establish suitability for every New Mexico site.

  • Fire-Resistant Plants for Home Landscapes (PNW 590) · Official scoped edition
    • ID, OR, WA; partial normalized coverage · 2023-10-01

      The October 2023 joint Pacific Northwest Extension publication explicitly names Oregon, Washington, and Idaho and publishes more than 150 plant profiles. FireApproved has normalized 155 exact plant records from the source; publication scope does not assert that every listed plant suits every site within the three states.

2. Why this plant is relevant here

State distribution
Documented in AL, AR, AZ, CO, DC, GA, IA, ID, IL, IN, KY, MD, MI, MN, MO, MS, MT, NC, NE, NJ, NM, NY, OH, OR, PA, SC, SD, TN, TX, UT, VA, WA, WI, WV, WY.
Native range
Current cited native range in AL, AR, AZ, CO, DC, GA, IA, ID, IL, IN, KY, MD, MI, MN, MO, MT, NC, NE, NM, NY, OH, OR, PA, SC, SD, TN, TX, UT, VA, WA, WI, WV, WY.
Introduced / established
No introduced or established row is normalized; that does not prove native status.
USDA hardiness
Documented range 4–8.

3. Legal, ecological, and broader status

Legal-list status
Set a location for an exact legal-list result; source silence is not clearance.
Seed-list status
Set a location to compare the separate state noxious-weed seed layer.
Reported invasive here
No ecological invasive report is normalized; that does not prove noninvasiveness.
Broader regional context
Aggregate AK, HI, and L48 evidence is shown only as regional context, never as an exact-state finding.
Federal context
Federal designations remain separate from state legal-list results.
How to read this page

The status above is computed from the cited rows below: independent recommendations can support a fire-resistant result, an avoid row can produce keep-away, and disagreement stays visible as conflict. Placement notes preserve each source’s own scheme rather than translating unlike rules into one scale. This is evidence about a plant, not permission to plant it in every part of the defensible space; Zone 0 remains noncombustible.

Nodding onion (Allium cernuum)
Photo: no rights reserved (CC0), via iNaturalist. Species-typical, not necessarily this cultivar.
Form
perennial
USDA hardiness
4–8
Current cited native range
AL, AR, AZ, CO, DC, GA, IA, ID, IL, IN, KY, MD, MI, MN, MO, MT, NC, NE, NM, NY, OH, OR, PA, SC, SD, TN, TX, UT, VA, WA, WI, WV, WY
Grows in
AL, AR, AZ, CO, DC, GA, IA, ID +27
Rated in
British Columbia; Colorado / Rocky Mountain Front Range; Fremont County, Wyoming; New Mexico +3
Family
Amaryllidaceae
Evidence
7 cited sources

Native and introduced range evidence

These are exact U.S. botanical-area records from the cited range source. Native and introduced describe biogeographic relationship, not fire performance or planting approval. Doubtful and extinct rows stay visible but do not count as current presence.

Current native

33

exact source areas

Current introduced

0

exact source areas

Qualified

0

doubtful or extinct source rows

33 native source areas · World Checklist of Vascular Plants, version 16 v16, as of 2026-06-04
  • Alabama (AL)
  • Arkansas (AR)
  • Arizona (AZ)
  • Colorado (CO)
  • District of Columbia (DC)
  • Georgia (GA)
  • Iowa (IA)
  • Idaho (ID)
  • Illinois (IL)
  • Indiana (IN)
  • Kentucky (KY)
  • Maryland (MD)
  • Michigan (MI)
  • Minnesota (MN)
  • Missouri (MO)
  • Montana (MT)
  • North Carolina (NC)
  • Nebraska (NE)
  • New Mexico (NM)
  • New York (NY)
  • Ohio (OH)
  • Oregon (OR)
  • Pennsylvania (PA)
  • South Carolina (SC)
  • South Dakota (SD)
  • Tennessee (TN)
  • Texas (TX)
  • Utah (UT)
  • Virginia (VA)
  • Washington (WA)
  • Wisconsin (WI)
  • West Virginia (WV)
  • Wyoming (WY)

The lossless worldwide derivative is retained once in the research corpus; object pages repeat only exact U.S. areas needed by the local lens. The JSON twin carries the same page assertions.

Plant hardiness evidence

These values describe the plant source. Your ZIP zone comes from the separate 2023 USDA Plant Hardiness Zone Map. Whole-zone values stay whole-zone, and a single unresolved value is not treated as a tolerance range. Different source boundaries stay separate: overlapping statements are compared independently, while only ranges with no shared zone are called a conflict.

Where its sources say to plant it

Placement rules below use each source's own distances or named zones, tied to its rating. They are not interchangeable with the directory's current Zone 0 guidance.

The evidence

Grouped by what each source concluded. Primary evidence rated the plant itself (a lab, field program, or original curation); corroboration compiled or republished another source's rating and resolves to its root lineage.

Recommends (7)

Same genus in the directory · the Allium group page

Last verified 2026-08-23. JSON (CC BY 4.0)

Profiles: USDA PLANTS · GBIF · iNaturalist · Wikidata · ITIS

Allium cernuum (Nodding onion). FireApproved. https://fireapproved.com/plants/allium-cernuum/. Last verified 2026-08-23.