• Photo of Rhododendron canescens (Rhododendron canescenss)

Plant Profile: Rhododendron canescens

Taxonomy: Rhododendron canescens

Names

Hoary Azalea, Mountain Azalea, Piedmont Azalea, Pinxter Flower, Southern Pinxter Azaelea

  • Photo of Rhododendron canescens (Rhododendron canescenss)

Phonetic Spelling:rho-doh-DEN-dron kan-ESS-senz

Genus:Rhododendron

Species:canescens

Family:Ericaceae

Rhododendron canescens, often referred to as mountain azalea, Piedmont azalea, hoary azalea, or Florida pinkster, is a sizable deciduous shrub indigenous to the moist woodlands, swamp edges, and stream banks stretching from North Carolina to Florida, and extending westward to Tennessee, Arkansas, and Texas. In cultivated settings, it generally reaches heights of 6 to 8 feet, though it can occasionally grow taller, up to 10 to 15 feet. The bark of this shrub is characterized by a gray to reddish-brown hue and has a finely shredded texture.

This species can sometimes propagate through stolons, or runners.

**Habitat:** Coastal plains

**Seasons of Interest:**
- **Leaves:** Fall
- **Blooms:** Early spring to spring
- **Fruits/Seeds:** Fall

The genus Rhododendron is known to support the specialized bee species Andrena (Andrena) cornelli.

**Pests, Diseases, and Other Issues:** Rhododendrons are prone to various insect infestations and diseases. Common insect threats include aphids, borers, lacebugs, leafhoppers, mealybugs, mites, nematodes, scale, thrips, and whiteflies. They may also suffer from diseases such as canker, crown rot, root rot, leaf spot, rust, and powdery mildew. Exposure to full sun can lead to leaf scorch, while poor soil drainage can cause root rot. However, with proper care and placement, a healthy plant should encounter minimal issues.

For further details on Rhododendron, please refer to additional resources.

Rhododendron canescens Feature Summary

Rhododendron canescens Image Gallery

Tags

#fragrant
#hummingbirds
#deciduous
#poisonous
#drought tolerant
#wildlife plant
#moths
#nectar plant
#native shrub
#native bees
#specialized bees
#NC native
#pollinator plant
#multitrunked
#larval host plant
#food source fall
#food source herbage
#food source nectar
#food source pollen
#Coastal FACW
#Piedmont Mountains FACW
#mammals
#butterfly friendly
#problem for cats
#problem for dogs
#bee friendly
#problem for horses
#audubon

Similar Plants

Rhododendron canescens Feature Summary

Attributes
North Carolina to Florida west to Tennessee, Arkansas and Texas
Hummingbirds and swallowtail butterflies are attracted to the blooms.
Fruit
Woody, elongated capsules. Displays from September to October.
Flowers
The Piedmont azalea features clusters (5-9 flowers per cluster) of fragrant, funnel-shaped, pink (infrequently white) flowers (1-2” long) in early spring as the foliage begins to emerge. Pistil and stamens of each flower protrude well beyond the corolla in an upward arch. It has a delicate sweet fragrance. Blooms from March to May.
Pink
White
1-3 inches
Leaves
The Piedmont azalea has obovate to elliptic, dull green leaves (to 3” long) which are gray-pubescent (canescent) beneath. The leaves, which are alternate and simple with a finely toothed margin, have rusty red fall color.
Green
Red/Burgundy
Elliptical
Obovate
3-6 inches
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
Seeds
Leaves
Stems
Flowers
Bark
Fruits
Roots
Whole Plant Traits
Shrub
Native Plant
Poisonous
Multi-trunked
Medium
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)
Dappled Sunlight (Shade through upper canopy all day)
Acid (<6.0)
Good Drainage
Moist
Coastal
Mountains
Piedmont
5b
5a
6a
6b
7a
7b
8b
8a
9a
9b
High Organic Matter
Landscape
Butterfly Garden
Pollinator Garden
Woodland
Naturalized Area
Houseplants
Butterflies
Pollinators
Bees
Small Mammals
Specialized Bees
Hummingbirds
Poisonous to Humans
Problem for Cats
Problem for Dogs
Problem for Horses
Bark
Light Gray
Light Brown
Red/Burgundy

Rhododendron canescens Attributes

Rhododendron canescens: Distribution

North Carolina to Florida west to Tennessee, Arkansas and Texas

Rhododendron canescens: Wildlife Value

Hummingbirds and swallowtail butterflies are attracted to the blooms.

Rhododendron canescens: Life Cycle

Annual
Biennial
Bulb
Perennial
Woody

Rhododendron canescens Fruit

Rhododendron canescens: Fruit Description

Woody, elongated capsules. Displays from September to October.

Rhododendron canescens: Fruit Type

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

Rhododendron canescens: Display/Harvest Time

Fall
Spring
Summer
Winter

Rhododendron canescens Flowers

Rhododendron canescens: Flower Description

The Piedmont azalea features clusters (5-9 flowers per cluster) of fragrant, funnel-shaped, pink (infrequently white) flowers (1-2” long) in early spring as the foliage begins to emerge. Pistil and stamens of each flower protrude well beyond the corolla in an upward arch. It has a delicate sweet fragrance. Blooms from March to May.

Rhododendron canescens: Flower Color

filter_vintage
Pink
filter_vintage
White

Rhododendron canescens: Flower Value To Gardener

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

Rhododendron canescens: Flower Bloom Time

Winter
Spring
Summer
Fall

Rhododendron canescens: Flower Shape

Bell
Cross
Crown
Cup
Dome
Funnel
Irregular
Lipped
Radial
Saucer
Star
Trumpet
Tubular
Urn
Wheel

Rhododendron canescens: Flower Size

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

Rhododendron canescens Leaves

Rhododendron canescens: Leaf Description

The Piedmont azalea has obovate to elliptic, dull green leaves (to 3” long) which are gray-pubescent (canescent) beneath. The leaves, which are alternate and simple with a finely toothed margin, have rusty red fall color.

Rhododendron canescens: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Rhododendron canescens: Leaf Color

spa
Green
spa
Red/Burgundy

Rhododendron canescens: Deciduous Leaf Fall Color

spa
Red/Burgundy

Rhododendron canescens: Leaf Type

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

Rhododendron canescens: Leaf Arrangement

Alternate
Opposite
Other/more complex
Rosulate
Whorled

Rhododendron canescens: 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 canescens: Leaf Margin

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

Rhododendron canescens: Hairs Present

No
Yes

Rhododendron canescens: Leaf Length

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

Rhododendron canescens Poisonous to Humans

Rhododendron canescens: 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 canescens: Poison Toxic Principle

Andromedotoxin, Grayantoxin

Rhododendron canescens: Poison Severity

High
Low
Medium

Rhododendron canescens: Causes Contact Dermatitis

No
Yes

Rhododendron canescens: Poison Part

Bark
Flowers
Fruits
Leaves
Roots
Sap/Juice
Seeds
Stems

Rhododendron canescens Whole Plant Traits

Rhododendron canescens: 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 canescens: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Rhododendron canescens: 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 canescens: Texture

Fine
Medium
Coarse

Rhododendron canescens Cultural Conditions

Rhododendron canescens: 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 canescens: Soil pH

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

Rhododendron canescens: Soil Drainage

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

Rhododendron canescens: NC Region

Coastal
Mountains
Piedmont

Rhododendron canescens: USDA Plant Hardiness Zone

thermostat
5a
thermostat
5b
thermostat
6a
thermostat
6b
thermostat
7a
thermostat
7b
thermostat
8a
thermostat
8b
thermostat
9a
thermostat
9b

Rhododendron canescens: Soil Texture

Clay
High Organic Matter
Loam (Silt)
Sand
Shallow Rocky

Rhododendron canescens Stem

Rhododendron canescens: Stem Is Aromatic

No
Yes

Rhododendron canescens Landscape

Rhododendron canescens: 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 canescens: 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 canescens: Attracts

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

Rhododendron canescens: 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

Rhododendron canescens Bark

Rhododendron canescens: Bark Color

grass
Light Brown
grass
Light Gray
grass
Red/Burgundy

Rhododendron canescens: Surface/Attachment

Bumpy
Exfoliating
Fissured
Furrowed
Lenticels
Papery
Patchy
Peeling
Ridges
Scaly
Shaggy
Shiny
Shredding
Smooth
Spongy