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Fire-resistant is not fireproof
On-list is not fireproof. PNW 590 (October 2023) prints the sentence Fire-resistant does not mean fireproof. Even fire-resistant plants will burn if not well maintained. Keep them watered and pruned. A fire-resistant status on this site is a computed evidence class from independent lineages. It is not a lab pass and not a promise.
You are holding a nursery tag, or an on-list record such as Amelanchier, and reading fire-resistant as will-not-burn. PNW 590 uses a serviceberry photograph as its fire-resistant example — open branching, moist leaves — and still stamps the fireproof caveat on the shrub pages that list Amelanchier species. The plant can still ignite. Zone 0 is still not a planting list.
This page is the plant-status distinction. Fire-resistant plants are not noncombustible is the materials distinction (ASTM E136). Do not merge those two sentences.
Why it matters
People hear on-list and plant at the foundation. PNW 590’s own definition is weaker than that hope: fire-resistant plants do not readily ignite, can be damaged or even killed by fire, and tend to produce fewer embers. Moisture, age, volume, dead material, and chemistry still change how they burn. The 2010 Oak Knoll Fire pages in the same publication show Leyland cypress consumed. That is the flammable contrast, not a claim that the recommended list is fireproof.
How a status gets onto this page: verdicts tally by independent Tier-1 lineage. Majority direction classifies. A single lineage is limited-evidence. Ties stay conflict. Direct fire evidence is never silently outvoted. See methodology. None of those rules mint a plant that cannot burn.
How it works
PNW 590 (Detweiler, Fitzgerald, Cowan, Bell, Stokely; revised October 2023) is a joint Oregon / Washington / Idaho Extension publication. The on-file extract is the opened text this session. The live catalog host returned no body.
From the introduction:
- Fire-resistant plants do not readily ignite from a flame or other ignition sources.
- They can be damaged or even killed by fire.
- They tend to produce fewer embers, which the authors call the most common cause for homes burning in wildfires.
- Foliage and stems do not significantly contribute to fuel and fire intensity.
- Plant moisture, age, total volume, dead material, and chemical content still matter.
- The boxed line: Fire-resistant does not mean fireproof. Even fire-resistant plants will burn if not well maintained.
- Taking HIZ actions (reduce fuels, clean debris, use fire-resistant plants) does not ensure that a home or community will survive a wildfire. It can improve the odds.
The same book lists Amelanchier species (serviceberry) as a fire-resistant shrub and tree, names the native A. alnifolia, and says A. laevis (Allegheny serviceberry) can also be used. The genus record here currently computes as on-list, consensus. That is several lineages recommending it. It is not PNW 590 taking the caveat back.
The fire-resistant photograph in the introduction is captioned as a serviceberry with open branching patterns and moist leaves, set against an arborvitae with dry dead interior material. Identification of that photograph to a species is not claimed here. The listed taxon is.
The paths
| Phrase | What it claims | What it does not claim |
|---|---|---|
| On-list / fire-resistant (this site) | Independent lineages recommended the taxon | The plant will not ignite |
| PNW 590 fire-resistant | Does not readily ignite; fewer embers; still needs water and pruning | Fireproof |
| Limited evidence | One lineage classified it | Unrated, or a Zone 0 pass |
| Conflict | Lineages disagree | A compromise grade of “sort of fireproof” |
| Noncombustible | ASTM E136 on a material | A plant status |
| Zone 0 | Hardscape | A palette of on-list shrubs |
What people mix up
- On-list as fireproof.
- Fire-resistant as noncombustible.
- The PNW 590 list as a deletion of its own boxed caveat.
- Limited-evidence as “not yet fireproof.”
- Conflict as “plant it, the site could not decide.”
- Putting serviceberry, or any on-list shrub, in the first five feet because a photograph looked moist.
How to check
- Open the plant record. Read the computed status and every evidence row.
- Open PNW 590. Find Fire-resistant does not mean fireproof and the definition on page 5 of the 2023 revision.
- If the plant is Amelanchier, open the genus and A. laevis. Do not treat either as fireproof.
- Measure five feet. On-list does not enter Zone 0.
- For the E136 sentence, open fire-resistant plants are not noncombustible.
Limits
This page quotes the opened October 2023 PNW 590 extract. It does not reprint the 161-plant gallery. It does not re-open every lineage on the Amelanchier records. It does not decide a planting permit. Exhibit ZON-021 is the placement-card template, not a species. This site does not approve plants.
Related records
- Amelanchier
- Amelanchier laevis
- Fire-resistant plants are not noncombustible
- What limited evidence means
- Methodology
- Zone 0
Questions
If a plant is on-list here, is it fireproof?
No. PNW 590 (October 2023) states fire-resistant does not mean fireproof, and that even fire-resistant plants will burn if not well maintained. On-list on this site means independent lineages recommended the taxon. It does not mean the plant cannot ignite.
What does PNW 590 say fire-resistant plants are?
Plants that do not readily ignite from a flame or other ignition sources. They can be damaged or even killed by fire. They tend to produce fewer embers. Foliage and stems do not significantly contribute to fuel and fire intensity. Moisture, age, volume, dead material, and chemistry still change how they burn.
Is that the same as noncombustible?
No. Noncombustible is ASTM E136, a materials test. Fire-resistant here is a plant evidence class. See fire-resistant plants are not noncombustible.
Why use serviceberry as the example?
PNW 590 uses a serviceberry photograph as its fire-resistant example (open branching, moist leaves) and lists Amelanchier species in the shrub and tree chapters, including A. laevis. The same publication stamps Fire-resistant does not mean fireproof on those pages. The genus record here currently computes as on-list.
Can I put an on-list plant in Zone 0 because it is fire-resistant?
No. Zone 0 is not a planting list. PNW 590’s own actions list does not ensure a home will survive a wildfire.