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Liliaceae family

Red Hills Soap Plant Chlorogalum grandiflorum

Native

Red Hills Soap Plant is a perennial wildflower native to the lower 48 states.

More about this plant

Chlorogalum grandiflorum is a species of flowering plant known by the common name Red Hills soap plant. It is endemic to the Sierra Nevada foothills, such as the Red Hills, of California, where it grows in chaparral, woodland, and forest. Wikipedia →

Growing & care

USDA PLANTS · TRY
Conditions
Sources · Conditions
Cold hardiness (derived) — Hardiness
Hardiness
≥ zone 11 derived from its U.S. range
Size & form
Sources · Size & form
USDA PLANTS — Lifespan
Lifespan
Perennial
In the garden
Herb layer — Sits in the herb of a layered food forest or polyculture.Open guide →
derived roles
Species characteristics from USDA PLANTS (public domain) + TRY (CC BY) — general guidance, not a guarantee for your exact site. Deer "browsing" is documented palatability, not a deer-proof claim.

Wildlife & pollinators

How pollinator value is scored →
❧ Caterpillar hosts Documented caterpillar host

Recorded feeding on Chlorogalum in North America, including:

Incisalia augustinus · gossamer-winged butterfly
Named species (a documented Nearctic sample, not exhaustive) from NHM HOSTS (CC0).
✦ Bees 2 bee visitors

2 native & managed bee species are documented visiting Red Hills Soap Plant :

Apis mellifera · Honey Bee Bombus vosnesenskii · Vosnesensky Bumble Bee
Visitor records (observations, not exhaustive) from Noori et al. 2026 (CC BY 4.0) · GloBI →
Species thumbnails re-hosted from iNaturalist — Creative Commons, credited per image (hover for credit). Click any species to see it on iNaturalist. Not exhaustive; many taxa have no openly-licensed photo yet.
Sources for this entry (13) Open & cited
[01] Scientific name & family — USDA PLANTS (DwCA, Zenodo 17903503)
[02] Growth habit & duration — USDA PLANTS (DwCA, Zenodo 17903503)
[03] Native status & distribution — USDA PLANTS (DwCA, Zenodo 17903503)
[04] Common name — USDA PLANTS (via GBIF)
[05] Invasive / introduced status — USDA PLANTS (DwCA, Zenodo 17903503) — native status
[07] Description — Wikipedia (CC BY-SA)
[08] Ecological value — GloBI
[09] Cold hardiness (derived) — Derived from U.S. range × USDA PHZM zones
[11] Flower-visitor value (derived) — Noori et al. 2026 (CC BY 4.0) · GloBI
[12] Caterpillar species — NHM HOSTS (CC0)
[13] County range — GBIF Open Data — open-licensed occurrences (CC0/CC-BY) → county
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PlantKey’s data is open under CC BY-SA 4.0 — free to reuse and adapt, with attribution and the same licence. Photos keep their own per-image licence + credit (see Sources above).

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