Diablo helianthella
Helianthella castanea
Last reviewed: November 2026
Diablo helianthella (Helianthella castanea) is a perennial forb native to CA. It blooms in April, May, and June. The flowers draw bees.
Watering reminders and freeze alerts for Diablo helianthella, free in the app.
Toxicity unknown
Diablo helianthella (Helianthella castanea) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
Light
full sun
Water
medium
Size
12"–36" H × 12"–18" W
Bloom
Apr, May, Jun
Native to
CA
Pollinators
bees
Before you buy
Your city may pay you to plant this
Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 461 programs across 44 states, each with a link to the provider and the date we last checked it.
Find rebates in your areaPicture natives in your own yard
Upload a photo of your yard and Patch Vision shows a rendering of it planted with natives for your region, like Diablo helianthella.
Browse plants for this ecoregion
An upright perennial sunflower relative with large, rough-textured leaves and bright yellow flower heads held singly on tall stems. It is a rare species restricted to grassland and woodland-edge habitat.
Growing Diablo helianthella
Grow Diablo helianthella in full sun and medium water. Mature plants reach 12 to 36 inches tall and spread 12 to 18 inches wide.
Wildlife value
The showy spring and early summer flowers attract native bees, including specialist sunflower-family visitors.
Common questions
- How much sun does Diablo helianthella need?
- Diablo helianthella grows best in full sun conditions.
- When does Diablo helianthella bloom?
- Diablo helianthella blooms in April, May, and June.
- Where is Diablo helianthella native?
- Diablo helianthella (Helianthella castanea) is native to CA, per the World Checklist of Vascular Plants (Kew).
- What pollinators does Diablo helianthella attract?
- Diablo helianthella draws bees.
Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
If something looks wrong
Common plant problems, and what to check first
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Ready to grow Diablo helianthella? Add it to your garden in the Pollinator Patch App to track it and get season-by-season care guidance.