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Boxwood has favorable regional listings, but the laboratory measurement does not settle whether the shrub itself is fire resistant.
Three regional authorities place boxwood on the safer side of their plant lists. Fire Safe Marin includes it among fire-resistant plants common to Marin County. The University of Arizona Cooperative Extension lists it as fire resistant for Yavapai County when irrigated and maintained, while the South Carolina Forestry Commission calls it less flammable with some fire resistance. These are useful local judgments, though South Carolina’s wording is relative rather than a claim that boxwood cannot burn.
Those cautions shape how the ratings should be used. Fire Safe Marin says placement, spacing, irrigation, and removal of dead material remain necessary for plants on its list. Arizona’s extension service likewise says fire-resistant plants are not fireproof. Those qualifications make the listings guidance for landscaping and upkeep, not guarantees about how every boxwood will behave.
One experiment found that boxwood litter, not predried, took 85 seconds to reach flaming in a calorimeter. That result measures ignition time for one plant part under one test setup. The FLAMITS database provides no shared pass-or-fail threshold across different variables, devices, and materials, so the number cannot classify a living boxwood shrub by itself. The practical reading is favorable but limited: regional authorities list boxwood as fire resistant or less flammable, while experimental evidence does not establish a broader verdict.
Form
shrub
Rated in
Global; Marin County, California; South Carolina; Yavapai County, Arizona
On this lot
1. Fire evidence and conditions
Fire evidence
Mixed evidence — location does not change the cited classification.
Marin County (CA footprint); partial normalized coverage · 2019-01-01
The publication is explicitly limited to plants common to Marin County. FireApproved publishes 104 exact owners as Marin regional context while retaining its placement, spacing, irrigation, and maintenance boundary. It is not statewide California guidance or parcel suitability.
South Carolina Forestry Commission publishes this explicitly as its Fire Smart Plant List for South Carolina. FireApproved publishes 63 exact genus owners from 72 unique common-name labels; unsafe common-name mappings and duplicates are not broadened. The brochure calls the list non-inclusive and does not establish species-level or site-specific suitability.
Yavapai County (AZ footprint); partial normalized coverage · 2025-03-14
University of Arizona Cooperative Extension authors Bulletin 34 for Yavapai County. FireApproved publishes 198 exact source owners from its resistant and prone tables and keeps the county boundary visible. County publication scope is regional Arizona context, never statewide scope.
2. Why this plant is relevant here
State distribution
Documented in AZ.
Native range
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.
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.
Landscaping Can Be Attractive & FIREWISE: SHRUBS [SCFC Fire Smart plant-form sections] (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.
Listed as Boxwood — Buxus sp.. The bulletin says fire-resistant plants tend to resist ignition when irrigated and maintained, while fire-prone plants may ignite readily and burn intensely.
3 cited rows from this source; its identity, lineage and tier are stated once.
Primary study Belcher2017: Belcher, C. M., & Hudspith, V. A. (2017). Changes to Cretaceous surface fire behaviour influenced the spread of the early angiosperms. New Phytologist, 213, 1521-1532.
Shared row context: plant part litter; fuel all; predrying no; device calorimeter; site Belcher2017-1; sampling .
