Rose Spirea
Spiraea douglasii
- Native to:
- Canada, United States
Epibase
Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Rosaceae
- Genus:
- Spiraea
- Species:
- Spiraea douglasii
- USDA Symbol:
- SPDO
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Shrub
- Height:
- 200 cm
- Light Requirements:
- Part Shade
- Drought Tolerance:
- Low
- Bloom Months:
- jun,jul,aug
- Bloom Colors:
- pink, rose
- Landscaping Shrub:
- Yes
Wildlife Benefits
- Bees:
- ★☆☆☆☆ Documented bee visitation (GBIF)
- Butterflies & Moths:
- ★☆☆☆☆ Documented Lepidoptera association (GBIF)
- Caterpillars:
- ★★☆☆☆ Recorded caterpillar host plant (HOSTS Database)
Keystone Species Ranking
- Caterpillar Keystone:
- ★★★★☆ Butterfly & moth species supported by this genus (NWF)
Host Plant for Caterpillars
Adelphagrotis indeterminata, Elegant Sheep Moth (Hemileuca eglanterina), Orthosia praeses, Orthosia revicta, Spiramater lutra, Spotted Tussock Moth (Lophocampa maculata), Lorquin's admiral (Basilarchia lorquini)
Reported Fauna Sightings
Bees: Brown-belted bumble bee (Bombus griseocollis), Fuzzy-horned bumble bee (Bombus mixtus), Obscure bumble bee (Bombus caliginosus), Red-belted bumble bee (Bombus rufocinctus), Sitka bumble bee (Bombus sitkensis), Two-form bumble bee (Bombus bifarius), Western bumble bee (Bombus occidentalis), Yellow bumble bee (Bombus fervidus), Yellow head bumble bee (Bombus flavifrons), Yellow-faced bumble bee (Bombus vosnesenskii)
Garden & Ecology Notes
- Wildlife Value:
- bees, butterflies, birds
- Deer Resistant:
- Yes
- Fall Color:
- yellow, orange
- Fire Ecology:
- Fire adapted — tolerates or benefits from fire
- Fire Notes:
- Resprouts vigorously from root crown following fire; often increases in density post-burn.
Soil Requirements
- Soil Type:
- moist, rich, well-drained loamy soil
- pH:
- 5.5 - 7.0 (slightly acidic to neutral)
- Drainage:
- tolerates poor drainage
- Moisture:
- consistently moist
- Notes:
- Commonly found in wetlands and riparian areas
Propagation & Germination
- Stratification:
- Cold/moist stratification required — 60–90 days
- Germination Time:
- 14–42 days
- Notes:
- Seeds require light for germination. Surface sow and do not cover.
The above propagation data sourced from Claude AI
Pre-treatment: Cold-moist stratification for 30 days at 1–5°C (34–41°F).
Source: Claude AI
ORGHPS Germination Guide: Sow @ 10C.