Smooth Azalea
Rhododendron arborescens
- Native to:
- United States
Cassidyrg






Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Ericaceae
- Genus:
- Rhododendron
- Species:
- Rhododendron arborescens
- USDA Symbol:
- RHAR3
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Shrub
- Height:
- 600 cm
- Light Requirements:
- Part Shade
- Drought Tolerance:
- Low
- Bloom Months:
- may,jun,jul
- Bloom Colors:
- white, pink
- Landscaping Shrub:
- Yes
Wildlife Benefits
- Butterflies & Moths:
- ★☆☆☆☆ Documented Lepidoptera association (GBIF)
Keystone Species Ranking
- Caterpillar Keystone:
- ★★★★☆ Butterfly & moth species supported by this genus (NWF)
Garden & Ecology Notes
- Wildlife Value:
- butterflies, hummingbirds
- Fragrant:
- Yes
- Fall Color:
- red, orange
Soil Requirements
- Soil Type:
- rich, well-drained loamy soil
- pH:
- 4.5 - 6.0 (acidic to slightly acidic)
- Drainage:
- excellent drainage required
- Moisture:
- consistently moist
- Notes:
- prefers organic matter-rich environments
Propagation & Germination
- Stratification:
- None required
- Germination Time:
- 14–42 days
- Notes:
- Seeds require light for germination and should be surface sown. Best germination occurs at 65-75°F with high humidity.
The above propagation data sourced from Claude AI
Pre-treatment: Cold-moist stratification for 30 days at 1–5°C (34–41°F).; then Cold-moist stratification for 60 days.
Source: Claude AI
ORGHPS Germination Guide: Sow @ 20°C. Seed germinates within 3 months * sprinkle seed on 10 cm damp sphagnum moss; cover with clear plastic pop bottle cut in half; transplant seedling to acidic mix in shade outdoors when 5 cm high; protect from rodents and give protection in cold frame first winter