California Tree-poppy
Romneya coulteri
Last reviewed: June 2026
Romneya coulteri is a large evergreen shrub native to Southern California that produces fragrant white poppy flowers from May through August. This drought-tolerant plant attracts bees and beetles in full sun locations.
California Tree-poppy (Romneya coulteri) is not on the ASPCA Animal Poison Control Center toxic plant list for dogs or cats (aspca.org (opens in new tab), last reviewed 2026-05-21). If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
Light
full sun
Water
low
Size
48"–96" H × 36"–72" W
Bloom
May, Jun, Jul, Aug
Native to
CA
Pollinators
bees, beetles
Browse plants for this ecoregion
A large shrub with striking white flowers that can reach 6 inches across with bright yellow centers. It blooms throughout summer with papery petals and creates a dramatic focal point in the landscape. This drought-tolerant native plant has blue-green foliage that provides a pleasing contrast to its showy flowers.
Growing California Tree-poppy
Grow California Tree-poppy in full sun and low water. Mature plants reach 48 to 96 inches tall and spread 36 to 72 inches wide. Expect moderate maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
California Tree-poppy is an HOA-friendly choice in the right placement. Maintenance level: moderate. Tidiness: 2 out of 5.
Works well in: mid zone, backyard only.
- Spreads aggressively via underground runners
- Can look somewhat messy after blooming
- Deciduous habit leaves bare patches in winter
Wildlife value
The large, showy flowers attract numerous native bees and beetles, providing important pollinator support during summer months. The abundant pollen is a valuable food source for beneficial insects.
Common questions
- When does Romneya coulteri bloom?
- California Tree-poppy blooms from May through August, producing large white flowers with bright yellow centers.
- What pollinators visit Romneya coulteri?
- This native California shrub attracts bees and beetles, which are drawn to its large, fragrant white flowers.
- Where is Romneya coulteri native?
- California Tree-poppy is native to California, particularly found in chaparral and coastal sage scrub communities in the southern part of the state.
- How much water does Romneya coulteri need?
- This drought-tolerant native requires low water once established and thrives in full sun conditions typical of its native California habitat.
- Is California Tree-poppy toxic to dogs?
- California Tree-poppy is not on the ASPCA Animal Poison Control Center toxic plant list for dogs (aspca.org).
- Is California Tree-poppy toxic to cats?
- California Tree-poppy is not on the ASPCA Animal Poison Control Center toxic plant list for cats (aspca.org).
- Is California Tree-poppy HOA-friendly?
- California Tree-poppy is generally an HOA-friendly choice in the right placement, with moderate maintenance.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Ready to grow California Tree-poppy? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Not sure where to start? Take the 2-minute yard quiz