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Hinoki false cypress is not consistently rated fire resistant: Michigan recommends it, while three other U.S.
sources warn against it.
The USDA Forest Service and state Firewise programs rate it 4, “Not Firewise,” the strongest warning on their four-level scale. Only VH exceeds hinoki’s H flammability rating on Ohio State University Extension’s five-band scale. Virginia Cooperative Extension and Virginia Tech also assign H on a three-level scale, although every evergreen tree and shrub in that source receives the same rating.
Michigan State University Extension reaches the opposite conclusion, listing hinoki false cypress among plants considered wildfire-resistant and recommended for Michigan’s climate. A Japanese classification does not resolve the dispute: Kyoritsu Shuppan places hinoki in the medium fire-protection-power class, between its large and small categories. The sources therefore approach the plant through different regional guidance and rating systems, and their conclusions do not line up.
Dead hinoki bark that was not dried before testing had a calorific value of 4,308.77 kilocalories per kilogram, a measure of heat released during combustion. FLAMITS retains measurements with their experimental context without applying a single recommendation threshold across different variables, devices and plant parts. For a homeowner, hinoki false cypress remains disputed: Michigan endorses it for its climate, while the USDA-linked, Ohio, and Virginia sources advise against it.
Michigan State University Extension Bulletin E2948 is explicitly a list of wildfire-resistant landscape plants for Michigan and includes a Michigan-native field. FireApproved publishes 221 exact GBIF owners from 226 represented source rows and holds 15 complex or non-exact rows. This dated publication scope is not a current site-suitability determination.
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 DC, DE, MD, NJ, OH, PA, WV.
Native range
Introduced / established
1 sourced range or established record. This is not an invasive warning.
USDA hardiness
Documented range 5–8.
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.
Plant hardiness evidence
These values describe the plant source. Your ZIP zone comes from the separate 2023 USDA
Plant Hardiness Zone Map. Whole-zone values stay whole-zone, and a single unresolved value
is not treated as a tolerance range. Different source boundaries stay separate: overlapping
statements are compared independently, while only ranges with no shared zone are called a conflict.
Source prints 5 · single-value meaning unresolved · whole zone precision · source stated
Source taxon: Chamaecyparis obtusa · exact match.
Source location: Cold Hardiness Zone field in the recovered selector record.
Not used for comparison: The recovered selector prints one Cold Hardiness Zone value but does not define it as a minimum threshold or a one-zone range.
5–8 explicit range · whole zone precision · source stated
Source taxon: Chamaecyparis obtusa · exact match.
Source location: Table 1, shrub row.
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.
Eastern United States Fire Performance Plant Selector: Landscape Zone 2 — 5–10 ft from the structure; maintained lawn or fuel breaks, with easily ignited evergreens avoided [Fire Performance Plant Selector landscape zone] (with its avoid rating)
Firewise Landscaping: keep 30 ft from the home (Zone 3) [OSU B921 source-category siting] (with its avoid rating)
Tree fire-protection classification in Hito to Shinrin: ヒノキ — Table 10-2 [tadaki-kira-1982-fire-protection-power] (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.
Tree fire-protection classification in Hito to Shinrin (人と森林) — Kyoritsu Shuppan; table reproduced by Kagoshima Prefecture · Hito to Shinrin (1982), Table 10-2; Kagoshima web reproduction · original sourcePrimary evidenceExpert-curatedlineage: independent (root of Japanese municipal fire-protection tree lists)
Table 10-2 prints ヒノキ in the medium fire-protection-power class. The Kagoshima reproduction says highly fire-protective trees can slow spread, promote upward dispersal of heat and smoke, and intercept flying embers.
Listed without a rating (3)Corroboration (3 rows from 1 source)
3 cited rows from this source; its identity, lineage and tier are stated once.
“calorific value (kcal/kg): 4308.77”
FLAMITS record 3605; Combustibility measurement; plant part bark; fuel dead; predrying no; device thermal analyzer; site Gani2007-1; sampling ND. Primary study Gani2007: Gani, A., & Naruse, I. (2007). Effect of cellulose and lignin content on pyrolysis and combustion characteristics for several types of biomass. Renewable energy, 32, 649-661.
Primary study Zhang2022: Zhang, S., Cornwell, W. K., Zhao, W., van Logtestijn, R. S., Krab, E. J., Aerts, R., & Cornelissen, J. H. (2022). Experimental evidence that leaf litter decomposability and flammability are decoupled across gymnosperm species. Journal of Ecology, 111, 761-772.
Shared row context: plant part leaves; fuel all; predrying yes; device burning bench; site Zhang2022-1; sampling january and march 2011.
