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Helianthella castanea
Also called Diablo Helianthella, Diablo Rock Rose, Diablo Rockrose
Mt. Diablo helianthella is a small, rare perennial herb native only to the hills east of San Francisco Bay in California, growing up to about 45 cm tall with one yellow daisy-like flower head per stem. It is a native wildflower best grown with full sun and very good drainage, and it is not a common garden subject.
Helianthella castanea is a rare plant endemic to California, and is found only in the San Francisco Bay Area, mostly in the hills east of the bay, including in Mount Diablo State Park, Wildcat Canyon Regional Park, Briones Regional Park, Las Trampas Regional Wilderness, and surrounding areas. Its common names include Mount Diablo helianthella, Mount Diablo sunflower, and Diablo rockrose.
Helianthella castanea is a herbaceous plant up to 45 cm (18 inches) tall. Leaves are up to 15 cm (6 inches) long. The plant usually produces one yellow flower head per stem. Each head contains both ray flowers and disc flowers.
California helianthella · Helianthella durangensis · Purpledisk helianthella · Parry's dwarf-sunflower · Fivenerve helianthella · Oneflower helianthella · Dwarf Sunflowers
Text excerpted from the Wikipedia article Helianthella castanea by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
