Douglas Iris
Iris douglasiana
Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Iridaceae
- Genus:
- Iris
- Species:
- Iris douglasiana
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Geophyte
- Height:
- 2-3 ft
- Light Requirements:
- Part Shade
- Drought Tolerance:
- High
- Bloom Months:
- mar, apr, may
- Bloom Colors:
- Blue
Native Range
United States: California, Oregon
Keystone Species Ranking
- Caterpillar Keystone:
- ★★★★☆ Based on number of butterfly and moth species using this genus as host plant (Source: National Wildlife Federation)
Reported Fauna Sightings
Bees: Sitka bumble bee (Bombus sitkensis), Sitka bumble bee (Bombus sitkensis)
Soil Requirements
- Soil Type:
- rich, well-drained loamy soil
- pH:
- 5.5 - 7.5 (slightly acidic to neutral)
- Drainage:
- excellent drainage required
- Moisture:
- dry to moderate
- Notes:
- native to coastal regions, prefers sandy loam
Germination Information
Pre-treatment: Seeds: Stratification for 1 month or 80 days of cool/moist stratification at 38°F. Rhizomes: Cut into pieces and directly potted.
Establishment: Seeds are collected between June 1st and August 31st. Rhizome divisions are collected in the fall. Seedlings will not grow large enough the first year and are held over another year. There are regional variations in the distribution of I. douglasiana.
Source: npn.rngr.net