Island bristleweed
Hazardia detonsa
Last reviewed: September 2026
Toxicity unknown
Island bristleweed (Hazardia detonsa) 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
low
Size
24"–72" H × 24"–60" W
Bloom
Apr, May, Jun, Jul, Aug
Native to
CA
Pollinators
bees, butterflies
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 452 programs across 44 states, each with a link to the provider and the date we last checked it.
Find rebates in your areaBrowse plants for this ecoregion
A rounded, fountain-shaped evergreen shrub in the sunflower family, with woolly, serrated leaves and abundant small yellow daisy-like flowers from spring into summer. Adapted to sandy, fast-draining soil and full sun.
In an HOA neighborhood
Island bristleweed is an HOA-friendly choice. Maintenance level: low. Tidiness: 3 out of 5.
Works well in: border planting, foundation planting, mixed native shrub border.
- A coastal-island endemic, so availability is limited to native-plant specialty nurseries
Wildlife value
Bright yellow blooms provide nectar for bees and butterflies, especially useful during the drier months when fewer other plants are flowering.
Common questions
- How much sun does Island bristleweed need?
- Island bristleweed grows best in full sun conditions.
- When does Island bristleweed bloom?
- Island bristleweed blooms in April, May, June, July, and August.
- Where is Island bristleweed native?
- Island bristleweed (Hazardia detonsa) is native to CA, per the World Checklist of Vascular Plants (Kew).
- What pollinators does Island bristleweed attract?
- Island bristleweed draws bees and butterflies.
- Is Island bristleweed HOA-friendly?
- Island bristleweed is generally an HOA-friendly choice in the right placement, with low maintenance.
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 Island bristleweed? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Planning a bed around it? Start a free plan with this plant
Not sure where to start? Take the 2-minute yard quiz