Enter your ZIP to see whether this is legal to plant in your state, and whether it survives your winter.
Ceanothus has a conflict among its source rows. The evidence table keeps those positions available for inspection instead of reducing the disagreement to a generic description of the genus.
The individual records remain in Ceanothus, separate from this genus-rank umbrella evidence. The cited rows answer questions about source lineage; related plants supplies same-form alternatives when the conflict rules this record out for your search. This route respects both the evidence scope and the reader's next decision.
City of Ashland (OR footprint); partial normalized coverage · 2026-08-26
This is a City of Ashland adoption fact, not statewide Oregon guidance or an experimental flammability result. FireApproved publishes 24 taxonomy-safe owners as city-level regulatory context. It applies to new planting and propagation within 30 feet of structures, including structures on adjacent lots; it is not projected as a blanket removal order for every established listed plant.
King County's current wildfire page links this list for the Puget Sound Basin. FireApproved publishes 82 exact source owners as basin context, not statewide Washington guidance or a site-specific recommendation.
University of Nevada Cooperative Extension compiled plants suited to Nevada climate zones and reported favorably by at least two upstream firewise lists. FireApproved publishes 126 exact source owners at Nevada publication scope. The source explicitly makes no independent flammability determination, so these rows remain corroborative.
Yavapai County (AZ footprint); partial normalized coverage · 2025-03-14
University of Arizona Cooperative Extension authors Bulletin 34 for Yavapai County. FireApproved publishes 198 exact source owners from its resistant and prone tables and keeps the county boundary visible. County publication scope is regional Arizona context, never statewide scope.
2. Why this plant is relevant here
State distribution
Documented in AZ.
Native range
Introduced / established
USDA hardiness
3. Legal, ecological, and broader status
Legal-list status
Seed-list status
Reported invasive here
Broader regional context
Federal context
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.
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.
Prohibited Flammable Plants: new planting or propagation restricted within 30 ft of any structure [Ashland Municipal Code setback] (with its avoid rating)
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.
Listed as Deerbrush — Ceanothus sp.. The bulletin says fire-resistant plants tend to resist ignition when irrigated and maintained, while fire-prone plants may ignite readily and burn intensely.
Listed without a rating (24)Corroboration (24 rows from 1 source)
24 cited rows from this source; its identity, lineage and tier are stated once.
Primary study Weise2005: Weise, D. R., White, R. H., Beall, F. C., & Etlinger, M. (2005). Use of the cone calorimeter to detect seasonal differences in selected combustion characteristics of ornamental vegetation. International Journal of Wildland Fire, 14, 321-338.
Shared row context: plant part leaves; fuel live; device calorimeter; site Weise2005-1.
“time to flaming (s): 204”
FLAMITS record 13770; Ignitability measurement; predrying no; sampling august.
“time to flaming (s): 98”
FLAMITS record 13771; Ignitability measurement; predrying no; sampling december.
Primary study White1996: White, R. H., Weise, D. R., & Frommer, S. (1996). Preliminary evaluation of the flammability of native and ornamental plants with the cone calorimeter. 21st International Conference on Fire Safety. Coimbra, Portugal.
Shared row context: Combustibility measurement; plant part leaves; fuel live; device calorimeter; site White1996-1; sampling ND.
Shared measurement context: predrying no.
“energy flux (kW/m²): 25”
FLAMITS record 13986.
“maximum energy flux (kW/m²): 55”
FLAMITS record 14011.
“maximum energy flux (kW/m²): 68”
FLAMITS record 14013.
“calorific value (kcal/kg): 979.26”
FLAMITS record 14014.
“calorific value (kcal/kg): 1218.11”
FLAMITS record 14056.
Shared measurement context: predrying yes.
“energy flux (kW/m²): 72”
FLAMITS record 13995.
“maximum energy flux (kW/m²): 138”
FLAMITS record 14012.
“calorific value (kcal/kg): 3534.91”
FLAMITS record 14046.
Primary study White2002: White, R. H., Weise, D. R., Mackes, K., & Dibble, A. C. (2002). Cone calorimeter testing of vegetation--an update. Ninth International Conference on Electrical and Electronic Products. Columbus, Ohio, USA.
Shared row context: Combustibility measurement; plant part leaves; fuel live; device calorimeter; site White2002-1.
