Use related plants to compare this wild lilac with other cited forms and range evidence to locate its geographic material. The genus page supplies the broader index without importing neighboring conclusions. That separation keeps the clearings study, limited pack, and pair of hardiness assertions attached to gloriosus itself. This exact accepted combination belongs only to the gloriosus entry.
Form
shrub
Rated in
British Columbia; California; OR/WA/ID; Oregon (Willamette Valley) +4
On this lot
1. Fire evidence and conditions
Fire evidence
Fire-resistant — location does not change the cited classification.
Willamette Valley (OR footprint); partial normalized coverage · 2015-02-01
OSU Extension says EM 9103 highlights fire-resistant plants that thrive under Willamette Valley growing conditions. FireApproved publishes 172 exact owners only as valley context. The guide shares the PNW 590 lineage and is not a second independent vote or statewide site clearance.
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.
Eastern Washington (WA footprint); partial normalized coverage
Washington DNR publishes the guide for Eastern Washington and says it compiles plants from other Firewise documents that are likely to thrive there. FireApproved publishes 46 exact owners only as eastern Washington context. The rows are corroborative, not empirical or statewide.
2. Why this plant is relevant here
State distribution
Documented in CA, ID, OR, WA.
Native range
Current cited native range in CA.
Introduced / established
USDA hardiness
Documented range 7–9.
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.
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.
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.
7–9 explicit range · whole zone precision · source stated
Source taxon: Ceanothus gloriosus · exact match.
Source location: Point Reyes ceanothus profile, USDA hardiness zones field.
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.
Low-volume and slow-burning vegetation for planting on cl…: Table 3: Poor performance [nord-green-brushland-clearing-performance] (mid-scale rating)
Fire-resistant Landscape Plants for the Willamette Valley: Point Reyes Ceanothus profile (PDF page 145) [osu-em-9103-profile] (with its recommendation)
Fire-resistant plant profile galleries: Point Reyes ceanothus — Ceanothus gloriosus [osu-2023-broadleaf-evergreens-gallery] (with its recommendation)
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.
