Cupressus sempervirens var. horizontalis (accepted: Cupressus sempervirens) · Cupressaceae · all Cupressus records · also called Horizontal common cypress · Wikipedia
The Place chip compares this record with your lot.
Only uncertain or inapplicable hardiness rows are cited; no primary zone is projected.
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 6 · single-value meaning unresolved · whole zone precision · source stated
Source taxon: Cupressus sempervirens · accepted name 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.
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.
Possible land management uses of common cypress to reduce…: selected-variety cypress barrier proposed for further study as a complementary Mediterranean management tool [cypfire-selected-variety-barrier] (mid-scale rating)
Possible land management uses of common cypress to reduce…: selected-variety cypress barrier proposed for further study as a complementary Mediterranean management tool [cypfire-selected-variety-barrier] (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.
2 cited rows from this source; its identity, lineage and tier are stated once.
“relatively resistant to ignition”
· condition: green
The study tested live crown material with April-August fuel moisture content of 84-95%. The authors attribute relative ignition resistance to high ash content, high critical heat flux, high time to ignition, and the leaves' ability to retain summer water. They use separate methods for the other flammability components and do not give an overall low-flammability class.
“low ignitability of crown and litter cypress samples”
· condition: dead material
The study tested dead litter at 14 ± 2% fuel moisture content from May-August and reports high time to ignition. The management discussion describes the deep dense litter as difficult to ignite, while still keeping ignitability, sustainability, combustibility, and consumability distinct rather than assigning one overall class.
Cupressus sempervirens var. horizontalis (Horizontal common cypress). FireApproved. https://fireapproved.com/plants/cupressus-sempervirens-var-horizontalis/. Last verified 2026-08-25.
