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Redflower false yucca is rated fire resistant, although the support comes mainly from expert recommendations and compiled plant lists.
Oregon State, Washington State, and University of Idaho Extension list the shrub as fire resistant, and Oregon State’s educational gallery recommends it for fire-resistant landscapes. Anaheim Fire & Rescue also places it on an acceptable fire-resistive plant list. Fire Safe Marin names it among fire-resistant plants common to Marin County, while cautioning that listed plants still require proper placement, spacing, irrigation, and removal of dead material. For the Sun City Texas Firewise Group, flammability hazard means ease of prolonged burning at high temperatures; it rates redflower false yucca “very low.”
The caution lies in the foundation beneath these recommendations. The University of California Forest Products Laboratory found that four earlier references recommended redflower false yucca for high-fire-risk areas, but its compilation warns that underlying plant lists often used undefined terms or lacked scientific support. The recommendations agree, yet their basis is limited.
Redflower false yucca is a shrub in the asparagus family, native to the South-Central United States. The joint extension guide assigns it USDA zones 5a through 10b. Those sources support treating it as a fire-resistant landscape choice, with Fire Safe Marin’s maintenance cautions kept firmly attached.
Form
shrub
Rated in
California; Georgetown, Texas; Marin County, California; OR/WA/ID +3
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.
Marin County (CA footprint); partial normalized coverage · 2019-01-01
The publication is explicitly limited to plants common to Marin County. FireApproved publishes 104 exact owners as Marin regional context while retaining its placement, spacing, irrigation, and maintenance boundary. It is not statewide California guidance or parcel suitability.
Southern Idaho (ID footprint); partial normalized coverage · 2013-11-08
The official database labels itself "For Southern Idaho" and describes Idaho residents at the urban-rangeland interface. FireApproved publishes 419 existing plant owners that cite its scored rows. This bounded Southern Idaho scope is regional context, not statewide coverage or a conclusion that the score transfers unchanged to every Idaho site.
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.
The October 2023 joint Pacific Northwest Extension publication explicitly names Oregon, Washington, and Idaho and publishes more than 150 plant profiles. FireApproved has normalized 155 exact plant records from the source; publication scope does not assert that every listed plant suits every site within the three states.
Sun City Texas, Georgetown (TX footprint); partial normalized coverage · 2015-01-14
The guide is authored for the Sun City Texas community in Georgetown. FireApproved publishes 142 exact owners only as community-level context. It is an archived HOA exhibit with unknown rating lineage, not a current statewide Texas source or an independent Tier 1 determination.
2. Why this plant is relevant here
State distribution
Documented in ID, OR, TX, WA.
Native range
Current cited native range in TX.
Introduced / established
USDA hardiness
Documented range 5–10.
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.
Native and introduced range evidence
These are exact U.S. botanical-area records from the cited range source. Native and
introduced describe biogeographic relationship, not fire performance or planting approval.
Doubtful and extinct rows stay visible but do not count as current presence.
The lossless worldwide derivative is retained once in the research corpus; object pages repeat only exact U.S. areas needed by the local lens. The JSON twin carries the same page assertions.
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.
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 Resistance of Plants Master Database: plantable at 40' from home [Idaho minimum planting distance] (mid-scale rating)
Fire-resistant plant profile galleries: Texas red yucca — Hesperaloe parviflora [osu-2023-broadleaf-evergreens-gallery] (with its recommendation)
Defensible Space Landscaping in the Urban/Wildland Interf…: Chapter 4, Landscape Vegetation Database [ucfpl-1997] (with its recommendation)
Firewise Plant Guide: Yuccas/Agaves/Succulents/Cacti/Sotols [Sun City plant-table sections] (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.
The table rates Yucca, Red — Hesperaloe parviflora very low for flammability hazard, defined as the ease a plant can burn at high temperatures for a prolonged time.
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 9,25,40,41)”
The Diablo Firesafe Council Guide to Plants lists Hesperaloe parviflora (Red yucca) as shrub, evergreen, in Table 1: plants with a favorable fire performance rating in 3 or more references. The guide cites 4 of its 57 numbered references for this row (9,25,40,41). 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.
