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Orange wattle cannot be called simply fire resistant because field and laboratory findings point in opposite directions.
Australian Plants Society Victoria’s field trial placed orange wattle in its fire-retardant class. That means it resisted the first flame wave but could burn after drying. This is weaker than the society’s fire-resistant class, reserved for plants that would not burn under continued flame.
The Algerian laboratory study reached the opposite conclusion, classifying the plant under the name Acacia cyanophylla as highly flammable. Its scale was based on fresh-material ignition delay, with ignition within 65 seconds receiving the high-flammability rating. These findings reflect different questions and settings: resistance during a field trial in Victoria versus ignition timing under laboratory conditions in western Algeria.
A related combustibility measurement recorded a flame height of 20.02 centimetres for live, predried twigs tested with an infrared burner in spring. Flame height describes the resulting flame under those test conditions, but the FLAMITS database does not set a common threshold that turns such measurements into resistant or flammable verdicts. For a homeowner, the safest reading is that orange wattle has shown some ability to resist an initial flame front, but it should not be treated as reliably fire resistant.
Questions
Why does this record show a conflict?
The computed recommendation is conflict. Fire Resistant and Retardant Plants is one named lineage in that split, not a tie-breaker. One ecological invasive report and a green test condition sit beside that split; they are not a second fire recommendation.
Global; Tlemcen, western Algeria; Victoria, Australia
Maintenance
2. Why this plant is relevant here
State distribution
Documented in CA.
Native range
Introduced / established
3 sourced range or established records. This is not an invasive warning.
USDA hardiness
3. Legal, ecological, and broader status
Legal-list status
Seed-list status
Reported invasive here
1 ecological invasive report.
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.
Conditions in the fire evidence
These describe tested or rated plant material. They are not horticultural maintenance instructions.
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 fire risk of the plant groupings with Cistus in the a…: Table 1 [henaoui-2013-fresh-material-flammability] (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.
10 cited rows from this source; its identity, lineage and tier are stated once.
Primary study Henaoui2013: Henaoui, S. E. -A., Bouazza, M., & Amara, M. (2013). The fire risk of the plant groupings with Cistus in the area of Tlemcen (Western Algeria). European Scientific Journal, 9, 84-103.
Shared row context: plant part twigs; fuel live; predrying yes; device infrared burner; site Henaoui2013-1; sampling spring.
“flame height (cm): 20.02”
FLAMITS record 4876; Combustibility measurement.
“time to flaming (s): 14.25”
FLAMITS record 4914; Ignitability measurement.
“burning duration (s): 112.51”
FLAMITS record 4952; Sustainability measurement.
Primary study Msweli2020: Msweli, S. T., Potts, A. J., Fritz, H., & Kraaij, T. (2020). Fire weather effects on flammability of indigenous and invasive alien plants in coastal fynbos and thicket shrublands (Cape Floristic Region). PeerJ, 8, e10161.
Shared row context: plant part branches; fuel all; predrying yes; device grill; site Msweli2020-1; sampling february to november.
FLAMITS record 16446; Combustibility measurement; plant part leaves; fuel live; predrying yes; device burning bench; site Nestola2022-1; sampling august 2019. Primary study Nestola2022: Nestola, E., Sgrigna, G., Pallozzi, E., Caccavale, L., Guidolotti, G., & Calfapietra, C. (2022). Experimental Characterization of Particulate and Gaseous Emissions from Biomass Burning of Six Mediterranean Species and Litter. Forests, 13, 322.
