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Toyon is rated fire resistant on limited primary evidence, with its clearest recommendation depending on active landscape care.
For irrigated hillsides, the University of California Agricultural Extension Service names toyon as a shrub for fire-protection landscaping when fuel volume is minimized, each plant receives the water it needs, and accumulated litter is removed. It supports choosing toyon as a fire-resistant shrub, but not treating an untended plant as equally suitable.
A University of California Forest Products Laboratory compilation reports conflicting information about toyon’s fire performance. The compilation drew from more than 25 earlier plant lists and warns that such lists often used undefined terms or lacked a scientific basis. Its mixed finding tempers the extension recommendation without erasing it.
One laboratory observation adds a narrow measurement: live, undried leaves collected in December took 157 seconds to begin flaming in a cone calorimeter. That number describes the tested leaves under those conditions, not the behavior of an entire shrub in a landscape fire. For a homeowner choosing among shrubs, toyon has qualified support as fire resistant, provided the irrigation, fuel reduction, and litter removal attached to that support are maintained.
Form
shrub
Region
EE. UU.
Rated in
California; Global
On this lot
1. Fire evidence and conditions
Fire evidence
Fire-resistant — location does not change the cited classification.
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
Native range
Current cited native range in CA.
Introduced / established
1 sourced range or established record. This is not an invasive warning.
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.
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.
Landscape for Fire Protection: irrigated hillsides [maire-1968-fire-protection-landscape] (with its recommendation)
Defensible Space Landscaping in the Urban/Wildland Interf…: Chapter 4, Landscape Vegetation Database [ucfpl-1997] (mid-scale 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.
Heteromeles arbutifolia (Toyon) appears in the source's conditioned examples for landscaping irrigated hillsides. Fuel volume is to be minimized, plants watered to their needs, and accumulated litter removed.
74 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): 157”
FLAMITS record 13761; Ignitability measurement; predrying no; sampling december.
“time to flaming (s): 182”
FLAMITS record 13762; Ignitability measurement; predrying no; sampling march.
“time to flaming (s): 254”
FLAMITS record 13763; Ignitability measurement; predrying no; sampling may.
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: plant part leaves; fuel live; device calorimeter; site White1996-1; sampling ND.
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.