• Photo of Rhododendron atlanticum (Rhododendron atlanticums)

Plant Profile: Rhododendron atlanticum

Taxonomy: Rhododendron atlanticum

Names

Coastal Azalea, Dwarf Azalea

  • Photo of Rhododendron atlanticum (Rhododendron atlanticums)

Phonetic Spelling:rho-doh-DEN-dron at-LAN-tih-kum

Genus:Rhododendron

Species:atlanticum

Family:Ericaceae

Rhododendron atlanticum, often referred to as Dwarf Azalea, is a small, loosely-branched, deciduous shrub that typically grows to a height and width of 2 to 3 feet, although it can occasionally reach up to 6 feet. Specimens that reach only 1 to 2 feet in height are frequently labeled as dwarf azaleas due to their petite stature. This shrub is characterized by its woody structure and its ability to spread through underground stolons.

Native to the coastal plains stretching from New Jersey and Pennsylvania down to Georgia, Dwarf Azaleas thrive in consistently moist, well-drained soil, as they are sensitive to overly wet conditions that can lead to root rot. To maintain moisture and regulate soil temperature, mulching with materials such as pine needles, bark, or compost is beneficial. It is advisable to position these plants in locations shielded from harsh winter winds and frosts, as their leaves are prone to burning and their flowers can suffer damage.

This species is frequently utilized in azalea breeding programs due to its highly fragrant blooms.

Fire Risk: This plant has a medium flammability rating.

Seasons of Interest:
- Blooms: Spring
- Nut/Fruit/Seed: Fall

In terms of pests and diseases, Rhododendrons are vulnerable to various issues, including canker, crown rot, root rot, leaf spot, rust, and powdery mildew. Exposure to full sun can scorch the leaves, and poor drainage can lead to root rot. Additionally, deer often cause damage to this plant.

WARNING: Highly toxic and potentially fatal if ingested!

For more information on Rhododendron, please refer to additional resources.

Rhododendron atlanticum Feature Summary

Rhododendron atlanticum Image Gallery

Tags

#fragrant
#hummingbirds
#showy flowers
#deciduous
#houseplant
#wildlife plant
#native shrub
#native bees
#interiorscape
#rabbit resistant
#hedges
#wet sites
#repeat bloom
#specialized bees
#fire
#medium flammability
#NC native
#pollinator plant
#larval host plant
#food source fall
#food source herbage
#food source nectar
#food source pollen
#coastal FAC
#Piedmont Mountains FAC
#nectar plant late spring
#mammals
#butterfly friendly
#nectar plant mid-spring
#problem for cats
#pollinator garden
#problem for dogs
#bee friendly
#problem for horses
#audubon

Similar Plants

Rhododendron atlanticum is often confused with:

Rhododendron atlanticum Feature Summary

Attributes
Coastal areas of the Eastern US
Nectar from flowers attract butterflies and members of the genus Rhododendron support the following specialized bee: Andrena (Andrena) cornelli.  Hummingbirds are attracted to the blooms.
medium flammability
Fruit
Displays from August to October.
Flowers
1.5" blooms form with sticky corollas and stamens that extend longer than the petals. From clusters up to 13" long. Dead-head spent flower clusters immediately after bloom. The fragrance is strong and musky. Blooms from April to May.
Pink
White
1-3 inches
Leaves
2 1/2 inches long, cillate hairs, blunt, rounded tips
Green
Blue
Elliptical
Ovate
1-3 inches
Bark
The bark is thin and gray/brown with fine scales.
Light Gray
Light Brown
Poisonous to Humans
Salivation, watering of eyes and nose, abdominal pain, loss of energy, depression, nausea and vomiting, diarrhea, weakness, cardiac failure, difficult breathing, progressive paralysis of arms and legs, coma.
Andromedotoxin, Grayantoxin
Leaves
Stems
Flowers
Bark
Fruits
Roots
Whole Plant Traits
Cultural Conditions
Full sun (6 or more hours of direct sunlight a day)
Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Acid (<6.0)
Good Drainage
Moist
Occasionally Wet
Occasionally Dry
Coastal
Landscape
Butterfly Garden
Pollinator Garden
Native Garden
Border
Hedge
Accent
Container
Woodland
Houseplants
Butterflies
Pollinators
Small Mammals
Specialized Bees
Problem for Cats
Problem for Dogs
Problem for Horses

Rhododendron atlanticum Attributes

Rhododendron atlanticum: Country Or Region Of Origin

Eastern US

Rhododendron atlanticum: Distribution

Coastal areas of the Eastern US

Rhododendron atlanticum: Wildlife Value

Nectar from flowers attract butterflies and members of the genus Rhododendron support the following specialized bee: Andrena (Andrena) cornelli.  Hummingbirds are attracted to the blooms.

Rhododendron atlanticum: Life Cycle

Annual
Biennial
Bulb
Perennial
Woody

Rhododendron atlanticum: Fire Risk Rating

extreme flammability
high flammability
low flammability
medium flammability

Rhododendron atlanticum Fruit

Rhododendron atlanticum: Fruit Description

Displays from August to October.

Rhododendron atlanticum: Fruit Type

Achene
Aggregate
Berry
Capsule
Caryopsis
Drupe
Follicle
Legume
Nut
Pome
Samara
Schizocarp
Siliqua

Rhododendron atlanticum: Fruit Value To Gardener

Edible
Fragrant
Good Cut
Good Dried
Long Bloom Season
Long-lasting
Showy

Rhododendron atlanticum: Display/Harvest Time

Fall
Spring
Summer
Winter

Rhododendron atlanticum Flowers

Rhododendron atlanticum: Flower Description

1.5" blooms form with sticky corollas and stamens that extend longer than the petals. From clusters up to 13" long. Dead-head spent flower clusters immediately after bloom. The fragrance is strong and musky. Blooms from April to May.

Rhododendron atlanticum: Flower Color

filter_vintage
Pink
filter_vintage
White

Rhododendron atlanticum: Flower Value To Gardener

Edible
Fragrant
Good Cut
Good Dried
Long Bloom Season
Long-lasting
Showy

Rhododendron atlanticum: Flower Bloom Time

Winter
Spring
Summer
Fall

Rhododendron atlanticum: Flower Size

1-3 inches
3-6 inches
< 1 inch
> 6 inches

Rhododendron atlanticum Leaves

Rhododendron atlanticum: Leaf Description

2 1/2 inches long, cillate hairs, blunt, rounded tips

Rhododendron atlanticum: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Rhododendron atlanticum: Leaf Color

spa
Blue
spa
Green

Rhododendron atlanticum: Leaf Type

Compound (Pinnately , Bipinnately, Palmately)
Fronds
Needles
Sheath
Simple

Rhododendron atlanticum: Leaf Arrangement

Alternate
Opposite
Other/more complex
Rosulate
Whorled

Rhododendron atlanticum: Leaf Shape

Acicular
Auriculate
Cordate
Cuneate
Deltoid
Elliptical
Filiform
Lanceolate
Linear
Oblanceolate
Oblong
Obovate
Obtuse
Orbicular
Ovate
Palmasect
Palmatifid
Peltate
Pinnatifid
Pinnatisect
Reniform
Rhomboidal
Spatulate
Subcordate
Subulate

Rhododendron atlanticum: Leaf Margin

Crenate
Crenulate
Dentate
Denticulate
Doubly Crenate
Doubly Dentate
Doubly Serrate
Entire
Lobed
Serrate
Sinuate
Undulate

Rhododendron atlanticum: Hairs Present

No
Yes

Rhododendron atlanticum: Leaf Length

< 1 inch
1-3 inches
3-6 inches
> 6 inches

Rhododendron atlanticum: Leaf Feel

Fleshy
Glossy
Leathery
Papery
Prickly
Rough
Rubbery
Slippery
Smooth
Soft
Velvety
Waxy

Rhododendron atlanticum Bark

Rhododendron atlanticum: Bark Description

The bark is thin and gray/brown with fine scales.

Rhododendron atlanticum: Bark Color

grass
Light Brown
grass
Light Gray

Rhododendron atlanticum Poisonous to Humans

Rhododendron atlanticum: Poison Symptoms

Salivation, watering of eyes and nose, abdominal pain, loss of energy, depression, nausea and vomiting, diarrhea, weakness, cardiac failure, difficult breathing, progressive paralysis of arms and legs, coma.

Rhododendron atlanticum: Poison Toxic Principle

Andromedotoxin, Grayantoxin

Rhododendron atlanticum: Poison Severity

High
Low
Medium

Rhododendron atlanticum: Causes Contact Dermatitis

No
Yes

Rhododendron atlanticum: Poison Part

Bark
Flowers
Fruits
Leaves
Roots
Sap/Juice
Seeds
Stems

Rhododendron atlanticum Whole Plant Traits

Rhododendron atlanticum: Plant Type

Annual
Bulb
Carnivorous
Edible
Epiphyte
Fern
Ground Cover
Herb
Herbaceous Perennial
Houseplant
Mushroom
Native Plant
Ornamental Grasses and Sedges
Perennial
Poisonous
Rose
Shrub
Succulent
Tree
Turfgrass
Vegetable
Vine
Water Plant
Weed
Wildflower

Rhododendron atlanticum: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Rhododendron atlanticum: Habit/Form

Arching
Ascending
Broad
Cascading
Climbing
Clumping
Columnar
Conical
Creeping
Dense
Erect
Horizontal
Irregular
Mounding
Multi-stemmed
Multi-trunked
Open
Oval
Prostrate
Pyramidal
Rounded
Spreading
Vase
Weeping

Rhododendron atlanticum: Growth Rate

Slow
Medium
Rapid

Rhododendron atlanticum: Maintenance

Low
Medium
High

Rhododendron atlanticum: Texture

Fine
Medium
Coarse

Rhododendron atlanticum Cultural Conditions

Rhododendron atlanticum: Light

Dappled Sunlight (Shade through upper canopy all day)
Deep shade (Less than 2 hours to no direct sunlight)
Full sun (6 or more hours of direct sunlight a day)
Partial Shade (Direct sunlight only part of the day, 2-6 hours)

Rhododendron atlanticum: Soil pH

Acid (<6.0)
Alkaline (>8.0)
Neutral (6.0-8.0)

Rhododendron atlanticum: Soil Drainage

Frequent Standing Water
Good Drainage
Moist
Occasional Flooding
Occasionally Dry
Occasionally Wet
Very Dry

Rhododendron atlanticum: Available Space To Plant

12 inches-3 feet
12-24 feet
24-60 feet
3 feet-6 feet
6-feet-12 feet
Less than 12 inches
more than 60 feet

Rhododendron atlanticum: NC Region

Coastal
Mountains
Piedmont

Rhododendron atlanticum: USDA Plant Hardiness Zone

thermostat
6a
thermostat
6b
thermostat
7a
thermostat
7b
thermostat
8a
thermostat
8b

Rhododendron atlanticum: Soil Texture

Clay
High Organic Matter
Loam (Silt)
Sand
Shallow Rocky

Rhododendron atlanticum Stem

Rhododendron atlanticum: Stem Color

grass
Brown/Copper

Rhododendron atlanticum: Stem Is Aromatic

No
Yes

Rhododendron atlanticum Landscape

Rhododendron atlanticum: Landscape Theme

Asian Garden
Butterfly Garden
Children's Garden
Cottage Garden
Cutting Garden
Drought Tolerant Garden
Edible Garden
English Garden
Fairy Garden
Garden for the Blind
Native Garden
Nighttime Garden
Pollinator Garden
Rain Garden
Rock Garden
Shade Garden
Water Garden
Winter Garden

Rhododendron atlanticum: Design Feature

Accent
Barrier
Border
Flowering Tree
Foundation Planting
Hedge
Mass Planting
Screen/Privacy
Security
Shade Tree
Small groups
Small Tree
Specimen
Street Tree
Understory Tree

Rhododendron atlanticum: Resistance To Challenges

Black Walnut
Compaction
Deer
Diseases
Drought
Dry Soil
Erosion
Fire
Foot Traffic
Heat
Heavy Shade
Humidity
Insect Pests
Pollution
Poor Soil
Rabbits
Salt
Slugs
Squirrels
Storm damage
Urban Conditions
Voles
Wet Soil
Wind

Rhododendron atlanticum: Landscape Location

Coastal
Container
Hanging Baskets
Houseplants
Lawn
Meadow
Naturalized Area
Near Septic
Patio
Pond
Pool/Hardscape
Recreational Play Area
Riparian
Rock Wall
Slope/Bank
Small Space
Vertical Spaces
Walkways
Woodland

Rhododendron atlanticum: Attracts

Bats
Bees
Butterflies
Frogs
Hummingbirds
Moths
Pollinators
Predatory Insects
Reptiles
Small Mammals
Songbirds
Specialized Bees

Rhododendron atlanticum: Problems

Allelopathic
Contact Dermatitis
Frequent Disease Problems
Frequent Insect Problems
Invasive Species
Malodorous
Messy
Poisonous to Humans
Problem for Cats
Problem for Children
Problem for Dogs
Problem for Horses
Short-lived
Spines/Thorns
Weak Wood
Weedy