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Buckthorn is generally rated fire resistant by western extension services, but Greek fire law treats Rhamnus as particularly flammable.
Three extension sources favor buckthorn. At least two of the western plant lists used by the University of Nevada Cooperative Extension favor buckthorn. Utah State University Extension says Rhamnus species can be firewise when properly placed and maintained. For Willamette Valley growing conditions, Oregon State University Extension Service recommends buckthorn as fire resistant; its hardiness zone varies by species.
The opposing judgment comes from the Hellenic Ministry of Environment and Energy. Its 2023 fire-protection regulation places Rhamnus among particularly flammable endemic trees and shrubs. This is a regulatory classification for properties in or near Greek forest land, while the favorable sources are expert guidance for western American landscapes. Those different regions and standards do not resolve the contradiction.
On balance, buckthorn falls on the fire-resistant side, but the label is conditional rather than universal. Proper placement and maintenance are part of Utah’s recommendation, Oregon’s applies to Willamette Valley conditions, and Greek authorities reach the opposite conclusion for their setting. For a planting decision, the guidance written for the local climate and fire rules deserves the most attention.
Form
shrub
Rated in
Greece; Nevada / Great Basin; Oregon (Willamette Valley); Utah / Intermountain West
On this lot
1. Fire evidence and conditions
Fire evidence
Fire-resistant — location does not change the cited classification.
Willamette Valley (OR footprint); partial normalized coverage · 2015-02-01
OSU Extension says EM 9103 highlights fire-resistant plants that thrive under Willamette Valley growing conditions. FireApproved publishes 172 exact owners only as valley context. The guide shares the PNW 590 lineage and is not a second independent vote or statewide site clearance.
University of Nevada Cooperative Extension compiled plants suited to Nevada climate zones and reported favorably by at least two upstream firewise lists. FireApproved publishes 126 exact source owners at Nevada publication scope. The source explicitly makes no independent flammability determination, so these rows remain corroborative.
Utah State University Extension states that this fact sheet selects examples for Utah landscapes and that they require proper placement and maintenance. FireApproved publishes 83 exact source owners at Utah publication scope. The table is not a site-specific planting clearance.
2. Why this plant is relevant here
State distribution
Documented in NV.
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.
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.
Fire-resistant Landscape Plants for the Willamette Valley: Buckthorn profile (PDF page 114) [osu-em-9103-profile] (with its recommendation)
Κανονισμός Πυροπροστασίας Ακινήτων εντός ή πλησίον δασικώ…: section 5.4.2, Table 2δi [greece-2023-particularly-flammable] (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.
