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Douglas iris has favorable fire-performance ratings, but they do not yet establish that it is fire resistant.
The University of California Forest Products Laboratory says 5 references recommended Douglas iris for use in high-fire-risk areas. The Diablo Firesafe Council also places it in a table for plants with favorable fire-performance ratings. The repeated favorable treatment is encouraging, although the sources do not take a firm overall side on fire resistance. Both organizations draw on earlier plant lists. The University of California report warns that those lists often use undefined terms and may lack a scientific basis. Diablo likewise says most of the ranking terms in its references were undefined. “Favorable” therefore does not represent one consistent measure across the underlying sources, so it cannot by itself settle how the plant will perform near a home. Douglas iris is a shrub in the iris family, native to the Southwestern and Northwestern United States. Its favorable recommendations deserve consideration, but calling the species fire resistant would go beyond what these ratings establish. For landscaping decisions, the sound conclusion is that Douglas iris has received favorable fire-performance judgments without a firm overall verdict.
Form
shrub
Rated in
California
On this lot
1. Fire evidence and conditions
Fire evidence
Mixed evidence — location does not change the cited classification.
The guide presents itself as fire performance ratings for common landscape plants in a fire-prone California setting. FireApproved publishes 104 exact owners as republished California context. It is not an independent rating, a current endorsement, or parcel suitability.
The UC Forest Products Laboratory says the guide covers properties of common California landscaping plants and was prepared for California fire agencies. FireApproved publishes 130 exact owners at historical California publication scope. The report is a 1997 compilation, not a current endorsement, site rating, or independent test of every row.
2. Why this plant is relevant here
State distribution
Documented in CA, OR.
Native range
Current cited native range in CA, OR.
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.
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.
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.
Defensible Space Landscaping in the Urban/Wildland Interf…: Chapter 4, Landscape Vegetation Database [ucfpl-1997] (with its recommendation)
Fire Performance of Common Plants: Table 1 (favorable in 3 or more references) [diablo-guide-to-plants-three-reference-vote] (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.
Fire Performance of Common Plants (Guide to Plants) — Diablo Firesafe Council · live page captured 2026-08-29 · original sourceCorroborationMirrorlineage: ucfpl-berkeley resolves to Defensible Space Landscaping in the Urban/Wildland Interface: A Compilation of Fire Performance Ratings of Residential Landscape Plants
“Table 1: favorable fire performance rating in 3 or more references (refs 11,15,17,40,41)”
The Diablo Firesafe Council Guide to Plants lists Iris douglasiana (Pacific coast iris, Douglas iris) as shrub, bulb, in Table 1: plants with a favorable fire performance rating in 3 or more references. The guide cites 5 of its 57 numbered references for this row (11,15,17,40,41). The guide states the ranking terms in its underlying references were mostly undefined and makes no attempt to rank within the list, and that fire performance is compromised without maintenance.
