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May has an avoid result in the cited row. The 2017 source classifies Spiraea catoniensis as highly flammable for its landscape guidance.
Its placement text calls for removal from the Building Protection Zone and avoidance in the Fuel Modified Zone. That is one source's prescribed siting, not a site-created distance rule. The page therefore remains limited evidence. The classification and both zone instructions come from the same row.
One ecological report separately records introduced-established status. related plants keeps the existing shrub comparisons, while the evidence table preserves the high-flammability wording and both source zones.
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.
Fire Resisting Garden Plants for the Urban Fringe and Rur…: remove from the Building Protection Zone; avoid in the Fuel Modified Zone [Texas Building Protection Zone] (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.
