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Swamp Azalea Rhododendron viscosum

Other Common Name(s):

Phonetic Spelling
rho-doh-DEN-dron vis-KOH-sum
This plant has high severity poison characteristics.
See below
Description

Woody, evergreen or deciduous shrubs that forms a thicket with age; loose open habit.  Toleartes wet planting sites.

Seasons of Interest:

Foliage: Fall, crimson  Bloom: Spring/Summer, May-July

Wildlife:  Members of the genus Rhododendron support the following specialized bee: Andrena (Andrena) cornelli Tolerates damage by rabbits.

Insects, Diseases, and Other Plant Problems:  Rhododendrons are susceptible to insect and disease problems.  Insect problems include aphids, borers, lacebugs, leafhoppers, mealybugs, mites, nematodes, scale, thrips and whitefly.  Diseases include canker, crown rot, root rot, leaf spot, rust, and powdery mildew.  Full sun can scorch the leaves and the roots rot if soil does not drain well.   A healthy plant in the right place with proper maintenance should have few problems. This plant is frequently damaged by deer. Early flowering makes it susceptible to spring freezes.

Compare this Plant to: R. arborescens, RatlanticumR. vaseyi

More information on Rhododendron.

Cultivars / Varieties:
  • 'Lemon Drop'
  • 'Pink Mist'
  • 'Pink Rocket'
  • 'Viscosum'
Tags:
#bees#hummingbirds#evergreen#deciduous#poisonous#drought tolerant#wildlife plant#nectar plant#wet sites#specialized bees#pollinator plant#food source summer#food source fall#Coastal OBL#food source herbage#food source nectar#food source pollen#Piedmont Mountains FACW#mammals#butterfly larvae#moth
 
Cultivars / Varieties:
  • 'Lemon Drop'
  • 'Pink Mist'
  • 'Pink Rocket'
  • 'Viscosum'
Tags:
#bees#hummingbirds#evergreen#deciduous#poisonous#drought tolerant#wildlife plant#nectar plant#wet sites#specialized bees#pollinator plant#food source summer#food source fall#Coastal OBL#food source herbage#food source nectar#food source pollen#Piedmont Mountains FACW#mammals#butterfly larvae#moth
  • Attributes:
    Genus:
    Rhododendron
    Species:
    viscosum
    Family:
    Ericaceae
    Life Cycle:
    Woody
    Wildlife Value:
    Members of the genus Rhododendron support the following specialized bee: Andrena (Andrena) cornelli. Tolerates damage by rabbits.
    Particularly Resistant To (Insects/Diseases/Other Problems):
    Heat, drought, and soil compaction tolerant.
    Dimensions:
    Height: 2 ft. 0 in. - 8 ft. 0 in.
    Width: 3 ft. 0 in. - 8 ft. 0 in.
  • Whole Plant Traits:
    Plant Type:
    Native Plant
    Poisonous
    Shrub
    Woody Plant Leaf Characteristics:
    Broadleaf Evergreen
    Deciduous
    Habit/Form:
    Open
    Spreading
  • Cultural Conditions:
    Light:
    Full sun (6 or more hours of direct sunlight a day)
    Partial Shade (Direct sunlight only part of the day, 2-6 hours)
    Soil Drainage:
    Good Drainage
    Moist
    Occasionally Wet
    Available Space To Plant:
    3 feet-6 feet
    NC Region:
    Coastal
    Mountains
    Piedmont
    Usda Plant Hardiness Zone:
    4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b
  • Fruit:
    Display/Harvest Time:
    Fall
    Summer
    Fruit Type:
    Capsule
    Fruit Description:
    Elongated capsule. Displays from July to October.
  • Flowers:
    Flower Color:
    White
    Flower Value To Gardener:
    Fragrant
    Showy
    Flower Bloom Time:
    Summer
    Flower Shape:
    Tubular
    Flower Petals:
    4-5 petals/rays
    fused petals
    Flower Description:
    Very fragrant, sticky white flowers bloom from May to July in a terminal cluster, tubular, 5-parted.
  • Leaves:
    Woody Plant Leaf Characteristics:
    Broadleaf Evergreen
    Deciduous
    Leaf Color:
    Green
    Red/Burgundy
    Leaf Type:
    Simple
    Leaf Arrangement:
    Alternate
    Leaf Margin:
    Entire
    Serrate
    Hairs Present:
    No
    Leaf Description:
    Alternate, simple, lustrous green leaves; smooth- or toothed-margined
  • Stem:
    Stem Is Aromatic:
    No
  • Landscape:
    Landscape Location:
    Houseplants
    Naturalized Area
    Woodland
    Landscape Theme:
    Butterfly Garden
    Pollinator Garden
    Attracts:
    Bees
    Butterflies
    Moths
    Pollinators
    Small Mammals
    Specialized Bees
    Resistance To Challenges:
    Drought
    Rabbits
    Wet Soil
    Problems:
    Poisonous to Humans
  • Poisonous to Humans:
    Poison Severity:
    High
    Poison Symptoms:
    Salivation, watering of eyes and nose, abdominal pain, loss of energy, depression, nausea and vomiting, diarrhea, weakness, difficult breathing, progressive paralysis of arms and legs, coma.
    Poison Toxic Principle:
    Andromedotoxin
    Causes Contact Dermatitis:
    No
    Poison Part:
    Bark
    Flowers
    Fruits
    Leaves
    Roots
    Seeds
    Stems