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Korean Rhododendron Rhododendron mucronulatum

Phonetic Spelling
rho-doh-DEN-dron myoo-kron-yoo-LAY-tum
This plant has high severity poison characteristics.
See below
Description

Korean Rhododendron is a woody deciduous shrub in the Ericaceae family.  It has spectacular showy pink flowers that appear in late winter to early spring before its diamond-shaped leaves appear.  It can be used as a houseplant or in interiorscape design in the landscape as a cultivated woody shrub in forested or natural area.

Seasons of Interest:

    Bloom: Late Winter/Early spring

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.

VIDEO Created by Elizabeth Meyer for "Trees, Shrubs and Conifers" a plant identification course offered in partnership with Longwood Gardens.

More information on Rhododendron.

Profile Video:
See this plant in the following landscape:
Cultivars / Varieties:
  • 'Cornell Pink'
    Rich pink flowers
  • 'Mahogany Red'
    Deep pink flowers
'Cornell Pink', 'Mahogany Red'
Tags:
#showy flowers#deciduous#wildlife plant#pink flowers#nectar plant#winter interest#specialized bees#pollinator plant#early spring flowers#nectar plant early spring#problem for cats#late winter flowers#problem for dogs#bee friendly#problem for horses#woodlands#nectar plant late winter
 
Cultivars / Varieties:
  • 'Cornell Pink'
    Rich pink flowers
  • 'Mahogany Red'
    Deep pink flowers
'Cornell Pink', 'Mahogany Red'
Tags:
#showy flowers#deciduous#wildlife plant#pink flowers#nectar plant#winter interest#specialized bees#pollinator plant#early spring flowers#nectar plant early spring#problem for cats#late winter flowers#problem for dogs#bee friendly#problem for horses#woodlands#nectar plant late winter
  • Attributes:
    Genus:
    Rhododendron
    Species:
    mucronulatum
    Country Or Region Of Origin:
    Northeastern North America
    Wildlife Value:
    Members of the genus Rhododendron support the following specialized bee: Andrena (Andrena) cornelli.
    Dimensions:
    Height: 4 ft. 0 in. - 8 ft. 0 in.
    Width: 4 ft. 0 in. - 8 ft. 0 in.
  • Whole Plant Traits:
    Plant Type:
    Poisonous
    Shrub
    Woody Plant Leaf Characteristics:
    Deciduous
    Maintenance:
    Low
    Texture:
    Fine
  • 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
  • Flowers:
    Flower Color:
    Pink
    Purple/Lavender
    Flower Value To Gardener:
    Showy
    Flower Bloom Time:
    Spring
    Winter
    Flower Description:
    Bright rosy pink to pinkish purple flowers in spring before leaves emerge
  • Leaves:
    Woody Plant Leaf Characteristics:
    Deciduous
    Leaf Color:
    Gold/Yellow
    Green
    Leaf Value To Gardener:
    Fragrant
    Deciduous Leaf Fall Color:
    Brown/Copper
    Gold/Yellow
    Red/Burgundy
    Leaf Type:
    Simple
    Leaf Arrangement:
    Alternate
    Leaf Margin:
    Entire
    Hairs Present:
    No
    Leaf Description:
    Alternate, simple, medium green leaves; aromatic when crushed; yellow, bronzy crimson red fall color
  • Stem:
    Stem Is Aromatic:
    No
  • Landscape:
    Landscape Location:
    Naturalized Area
    Woodland
    Landscape Theme:
    Pollinator Garden
    Winter Garden
    Attracts:
    Pollinators
    Specialized Bees
    Problems:
    Problem for Cats
    Problem for Dogs
    Problem for Horses
  • 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, cardiac failure, difficult breathing, progressive paralysis of arms and legs, coma.
    Poison Toxic Principle:
    Andromedotoxin, Grayantoxin
    Causes Contact Dermatitis:
    No
    Poison Part:
    Bark
    Flowers
    Fruits
    Leaves
    Roots
    Sap/Juice
    Seeds
    Stems