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Littleleaf boxwood is best treated as highly flammable near a home, despite one FireSmart approval and a moderate lab result.
Ohio State’s extension service gave the shrub an H rating, the second-highest band on its five-point flammability scale. Virginia Tech’s extension service also rated it H, the highest of its three bands. These expert ratings place littleleaf boxwood on the avoid side, although they come from different regions and use different scales.
FireSmart BC approved littleleaf boxwood as fire resistant under its binary system, but also flagged it as needing more research. In whole-plant burns, the USDA Forest Service and NIST placed it in the moderate cluster among 34 ornamental shrubs. A separate experiment recorded predried branches reaching flame in 4.55 seconds on a grill, but that database does not turn such measurements into a recommendation because devices, plant parts, and flammability traits are not directly interchangeable.
Littleleaf boxwood is a shrub in the Buxaceae family. Its FireSmart approval offers some reassurance, and the whole-plant test did not put it in the highest laboratory group. For landscaping close to a structure, the safer reading is to keep this shrub away.
Ohio State University Extension Bulletin 921 is an Ohio publication that describes Ohio fire seasons and landscape conditions and labels nativity to Ohio. FireApproved publishes 352 exact source-owning plant records from its eight rated tables. This historical publication scope does not assert current extension endorsement or that a listed plant suits every Ohio site.
Virginia Cooperative Extension's publication opens with Virginia wildfire conditions, identifies its Virginia Firewise Landscaping Task Force, and labels plants native to Virginia. FireApproved publishes 306 exact source owners. Publication scope does not establish parcel suitability or current endorsement of this archived 2009 list.
2. Why this plant is relevant here
State distribution
Documented in FL, GA, SC, NC, AL, MS, LA, TX.
Native range
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.
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.
Firewise Landscaping: do not plant within 5 ft of structures (keep out of Zone 1) [OSU B921 source-category siting] (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.
4 cited rows from this source; its identity, lineage and tier are stated once.
Primary study Murray2023: Murray, B. R., Hawthorne, T., Curran, T. J., Krix, D. W., Wallace, M. I., Young, K., ... & Webb, J. K. (2023). Shoot flammability patterns among plant species of the wildlandurban interface in the fire-prone Greater Blue Mountains World Heritage Area. International Journal of Wildland Fire, Online early.
Shared row context: plant part branches; fuel all; predrying yes; device grill; site Murray2023-1; sampling ND.
