Swamp Azalea

Rhododendron viscosum

Also known as: Texas Azalea

Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Ericaceae
Genus:
Rhododendron
Species:
Rhododendron viscosum

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Shrub
Height:
12-20 ft
Light Requirements:
Part Shade
Drought Tolerance:
High
Bloom Months:
may, jun, jul, aug
Bloom Colors:
White, Pink
Landscaping Shrub:
Yes

Native Range

United States: Alabama, Arkansas, Connecticut, District of Columbia, Delaware, Florida, Georgia, Louisiana, Massachusetts, Maryland, Maine, Mississippi, North Carolina, New Hampshire, New Jersey, New York, Oklahoma, Pennsylvania, Rhode Island, South Carolina, Tennessee, Texas, Virginia, Vermont, West Virginia

Keystone Species Ranking

Caterpillar Keystone:
★★☆☆☆ Based on number of butterfly and moth species using this genus as host plant (Source: National Wildlife Federation)

Host Plant for Caterpillars

Azalea sphinx (Darapsa choerilus), Gypsy moth (Lymantria dispar), Hydrangea sphinx (Darapsa versicolor), tritona dagger moth (Acronicta tritona)

Soil Requirements

Soil Type:
moist, acidic, well-drained soil
pH:
4.5 - 6.0 (acidic to slightly acidic)
Drainage:
excellent drainage required
Moisture:
consistently moist
Notes:
prefers organic-rich environments

Germination Information

Pre-treatment: Cold-moist stratification for 30 days at 1–5°C (34–41°F).; then Cold-moist stratification for 90 days.

Notes: Seeds may require light for germination.

Source: OpenAI GPT-4o