Douglas Iris plant profile
Iris douglasiana
A perennial flower for partial sun.
Last updated .
When to plant
When to plant Douglas Iris
An evergreen perennial that blooms every spring. It tolerates full sun but does best with filtered morning sun and bright shade most of the day, in slow-draining soil including heavy clay. Fall is the time to plant it, like other natives; it needs little or no summer water.
The calendar shows this cited seasonal window as an approximate band. It does not convert the season into frost-adjusted dates.
Open Douglas Iris in my garden calendarShows the source-backed planting season, not frost-adjusted dates.
Growing conditions
- Sun
- Partial sun
- Lifecycle
- Perennial
Next steps
Continue with Douglas Iris
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- Douglas Iris Adds Color to Shady Garden Areas (Iris douglasiana)
University of California Agriculture and Natural Resources (UC Master Gardener Program of Contra Costa County). Supports general reference. Checked 2026-06-18.