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Lesser Mexican-stonecrop is rated fire resistant, with a moisture-based Arboretum recommendation and supporting California plant compilations.
Sedum confusum appears in Category 1 of the Los Angeles State & County Arboretum's 1970 hillside-planting table. That is its greatest fire-retardance category, covering succulents with 90–95 percent moisture content. The categories concern leaf moisture in plants grown at the Arboretum under normal garden conditions. They do not describe the moisture of every stonecrop in a dry landscape.
The authors pair their recommendations with watering during the dry fire season and maintenance to reduce fuel, particularly litter removal and weed control. Those conditions matter when using the table to choose a groundcover.
The University of California Forest Products Laboratory later recorded six favorable references for this species. Diablo Firesafe Council also includes it in its favorable table. These compilations support the recommendation, while acknowledging that earlier sources often used undefined ranking terms. The most concrete finding remains the Arboretum's moisture category, interpreted with its growing and maintenance conditions.
Form
succulent
Rated in
California; Southern California
On this lot
1. Fire evidence and conditions
Fire evidence
Fire-resistant — location does not change the cited classification.
The guide presents itself as fire performance ratings for common landscape plants in a fire-prone California setting. FireApproved publishes 104 exact owners as republished California context. It is not an independent rating, a current endorsement, or parcel suitability.
The UC Forest Products Laboratory says the guide covers properties of common California landscaping plants and was prepared for California fire agencies. FireApproved publishes 130 exact owners at historical California publication scope. The report is a 1997 compilation, not a current endorsement, site rating, or independent test of every row.
2. Why this plant is relevant here
State distribution
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.
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.
Fire-Retardant Plants for Brush Fire Prevention in Hillsi…: Category 1 [la-arboretum-1970-leaf-moisture-fire-retardance] (with its recommendation)
Defensible Space Landscaping in the Urban/Wildland Interf…: Chapter 4, Landscape Vegetation Database [ucfpl-1997] (with its recommendation)
Fire Performance of Common Plants: Table 1 (favorable in 3 or more references) [diablo-guide-to-plants-three-reference-vote] (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.
“CATEGORY 1 — GREATEST FIRE RETARDANCE Succulents (moisture content 90-95%)”
· condition: green
Sedum confusum is one of 30 low-growing plants in the source's recommended Table 1. The category reflects leaf moisture capacity under normal garden conditions at the Arboretum.
Fire Performance of Common Plants (Guide to Plants) — Diablo Firesafe Council · live page captured 2026-08-29 · original sourceCorroborationMirrorlineage: ucfpl-berkeley resolves to Defensible Space Landscaping in the Urban/Wildland Interface: A Compilation of Fire Performance Ratings of Residential Landscape Plants
“Table 1: favorable fire performance rating in 3 or more references (refs 7,10,24,40,41,53)”
The Diablo Firesafe Council Guide to Plants lists Sedum confusum (Stonecrop, Sedum) as groundcover, succulent, in Table 1: plants with a favorable fire performance rating in 3 or more references. The guide cites 6 of its 57 numbered references for this row (7,10,24,40,41,53). The guide states the ranking terms in its underlying references were mostly undefined and makes no attempt to rank within the list, and that fire performance is compromised without maintenance.