Enter your ZIP to see whether this is legal to plant in your state, and whether it survives your winter.
No.
Oriental arborvitae is rated highly flammable and does not belong near structures.
Three public programs reach the same practical conclusion. Oriental arborvitae occupies the “Not Firewise” end of the four-level scale used by the USDA Forest Service Northeastern Area and state Firewise programs. Ohio State University Extension gives it high flammability, the fourth of five bands and an avoid rating. Virginia Cooperative Extension also rates it high, which is the top of its three-point scale. Together, these ratings support keeping Oriental arborvitae away from structures.
A southern Spain study offers a more limited laboratory view. Across 200 live-leaf samples tested without drying, Oriental arborvitae had 118.82 percent foliar moisture, averaged 23.1 seconds to ignition, and flamed for an average of 9.1 seconds. The study assigned Valette class 3, which its scale treats as mixed rather than avoid. FLAMITS preserves the same study’s ignition result for live leaves tested in summer without drying, but its database measurements do not carry a recommendation.
Oriental arborvitae is a tree in the cypress family, reaching about 15 feet at maturity and requiring moderate water. The laboratory classification is less severe than the landscaping verdicts, but it does not overturn their consistent warning. For planting near a home or other structure, the practical conclusion remains to avoid it.
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, FL, MD, NJ, OH, PA, PR, WV.
Native range
Introduced / established
2 sourced range or established records. This is not an invasive warning.
USDA hardiness
Documented minimum 4b; no upper limit is documented.
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.
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: Platycladus orientalis · 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.
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)
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 Molina2017: Molina, J. R., Martín, T., Rodríguez Y Silva, F., & Herrera, M. Á. (2017). The ignition index based on flammability of vegetation improves planning in the wildland-urban interface: A case study in Southern Spain. Landscape and Urban Planning, 158, 129-138.
Shared row context: plant part leaves; fuel live; predrying no; device epiradiator; site Molina2017-1; sampling summer.
FLAMITS record 13726; Combustibility measurement; plant part leaves; fuel live; predrying yes; device calorimeter; site Wang2009-1; sampling november. Primary study Wang2009: Wang, X., Niu, S., & Kan, Z. (2009). Properties and flammability of major tree species in the Beijing area. Frontiers of Forestry in China, 4, 304-308.
