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Hydrangeas have been rated, but the combined findings do not establish a clear overall fire-resistance verdict.
Hydrangea is a shrub in the Hydrangeaceae family. The University of Arizona Cooperative Extension in Yavapai County lists Hydrangea among fire-resistant plants when irrigated and maintained. The extension service says plants in this category tend to resist ignition under those conditions, but it also warns that they are not fireproof. Its fire-prone category covers plants that may ignite readily and burn intensely.
The South Carolina Forestry Commission places Hydrangea in its less-flammable category, which it describes as plants with some fire resistance. That category stands in contrast to its highly flammable plants, which ignite faster and burn readily. South Carolina’s wording is comparative, while Arizona uses a fire-resistant classification tied to irrigation and maintenance.
These two institutions place Hydrangea on the less hazardous side of their respective systems, but their categories are not interchangeable. The careful conclusion is that Hydrangea has received favorable classifications under two different schemes, while its overall fire-resistance verdict remains unsettled.
Form
shrub
Rated in
South Carolina; Yavapai County, Arizona
On this lot
1. Fire evidence and conditions
Fire evidence
Mixed evidence — location does not change the cited classification.
South Carolina Forestry Commission publishes this explicitly as its Fire Smart Plant List for South Carolina. FireApproved publishes 63 exact genus owners from 72 unique common-name labels; unsafe common-name mappings and duplicates are not broadened. The brochure calls the list non-inclusive and does not establish species-level or site-specific suitability.
Yavapai County (AZ footprint); partial normalized coverage · 2025-03-14
University of Arizona Cooperative Extension authors Bulletin 34 for Yavapai County. FireApproved publishes 198 exact source owners from its resistant and prone tables and keeps the county boundary visible. County publication scope is regional Arizona context, never statewide scope.
2. Why this plant is relevant here
State distribution
Documented in AZ.
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.
Landscaping Can Be Attractive & FIREWISE: SHRUBS [SCFC Fire Smart plant-form sections] (with its recommendation)
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.
Listed as Hydrangea — Hydrangea sp.. The bulletin says fire-resistant plants tend to resist ignition when irrigated and maintained, while fire-prone plants may ignite readily and burn intensely.
