Rhododendron 'Knaphill and Exbury Azaleas'
Common Name(s):
- Phonetic Spelling
- roh-do-DEN-dron
- This plant has low severity poison characteristics.
- See below
- Description
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Deciduous azaleas with large flower trusses in spring; excellent for naturalizing; resemble flame azaleas; excellent flower colors; very winter hardy; good fall color, moderate growth rate.
Seasons of Interest:
Bloom: Spring Foliage: Fall
Wildlife Value: Excellent nectar plant for bees, hummingbirds and butterflies. Members of the genus Rhododendron support the following specialized bee: Andrena (Andrena) cornelli.
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.
Form: Open; loose; spreading; upright
Poison Part: Parts of the plant may be poisonous.
For suitable alternatives, see this video created by Charlotte Glen as part of the Plants, Pests, and Pathogens series.
VIDEO Created by Elizabeth Meyer for "Trees, Shrubs and Conifers" a plant identification course offered in partnership with Longwood Gardens.
- Profile Video:
- See this plant in the following landscapes:
- Lush Foundation Planting Flower Bonanza Garden
- Cultivars / Varieties:
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- Tags:
- Cultivars / Varieties:
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- Tags:
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Attributes:
- Genus:
- Rhododendron
- Family:
- Ericaceae
- Dimensions:
- Height: 6 ft. 0 in. - 8 ft. 0 in.
- Width: 6 ft. 0 in. - 8 ft. 0 in.
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Whole Plant Traits:
- Plant Type:
- Poisonous
- Shrub
- Woody Plant Leaf Characteristics:
- Deciduous
- Habit/Form:
- Open
- Spreading
- Growth Rate:
- Medium
- Texture:
- Medium
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Cultural Conditions:
- Soil Drainage:
- Good Drainage
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Flowers:
- Flower Color:
- Gold/Yellow
- Orange
- Pink
- White
- Flower Value To Gardener:
- Showy
- Flower Bloom Time:
- Spring
- Flower Description:
- Flowers are born in trusses; individual flowers large and showy
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Leaves:
- Woody Plant Leaf Characteristics:
- Deciduous
- Leaf Color:
- Green
- Leaf Value To Gardener:
- Showy
- Deciduous Leaf Fall Color:
- Brown/Copper
- Hairs Present:
- No
- Leaf Description:
- May have bronze tinge; good fall color
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Stem:
- Stem Is Aromatic:
- No
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Landscape:
- Attracts:
- Butterflies
- Hummingbirds
- Pollinators
- Specialized Bees
- Problems:
- Problem for Cats
- Problem for Dogs
- Problem for Horses
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Poisonous to Humans:
- Poison Severity:
- Low
- 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
