California Tree-poppy
Romneya coulteri
Last reviewed: June 2026
California Tree-poppy (Romneya coulteri) is not on the ASPCA Animal Poison Control Center toxic plant list for dogs or cats (aspca.org, 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.
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.
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.
Does California Tree-poppy fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.