Island bristleweed
Hazardia detonsa
Last reviewed: October 2026
Island bristleweed (Hazardia detonsa) is a perennial shrub native to CA. It blooms in April, May, June, July, and August. The flowers draw bees and butterflies. It reads as an intentional, HOA-friendly planting in the right spot.
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 460 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 Island bristleweed.
Browse 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.
Growing Island bristleweed
Grow Island bristleweed in full sun and low water. Mature plants reach 24 to 72 inches tall and spread 24 to 60 inches wide. Expect low maintenance to keep it looking intentional in a front yard.
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.