Life Span
Perennial
Perennial
Type
Broadleaf Evergreen
Tree
Origin
-
United States, California
Types
Rhododendron aberconwayi, Rhododendron bulu, Rhododendron kanehirae
-
Number of Varieties
7008
0
40000
👆🏻
Habitat
moist forests
Woodland Garden Canopy
USDA Hardiness Zone
5-86-9
0
99
👆🏻
AHS Heat Zone
-
9-1
Sunset Zone
21,22
3a, 3b, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Habit
Spreading
Spreading
Plant Size
Minimum Height
150.00 cm1,520.00 cm
0
3900
👆🏻
Minimum Width
150.00 cm1,370.00 cm
0
6350
👆🏻
Plant Color
Flower Color
Red
Red, Yellow green
Flower Color Modifier
Bicolor
Bicolor
Fruit Color
Green, Tan
-
Leaf Color in Spring
Green
Green, Blue Green
Leaf Color in Summer
Green
Green, Blue Green
Leaf Color in Fall
Green
Yellow, Orange, Pink
Leaf Color in Winter
Green
-
Shape
Leaf Shape
Ovate
Irregular
Thorns
✔
✘
✔
✘
Plant Season
Spring, Summer, Fall, Winter
Spring, Summer, Fall, Winter
Growing Conditions
Sunlight
Full Sun, Partial Sun
Full Sun, Partial Sun
Growth Rate
Medium
Slow
Type of Soil
Loam, Sand
-
The pH of Soil
Acidic
-
Soil Drainage
Well drained
-
Bloom Time
Late Spring
Spring
Repeat Bloomer
✔
✘
✔
✘
Tolerances
-
Drought
Where to Plant?
Ground
Ground
How to Plant?
From Rhizomes, Seedlings, Stem Planting
Seedlings
Plant Maintenance
Medium
Medium
Watering Plants
Watering Requirements
Do Not over Water, Keep ground moist
Average Water Needs
In Summer
Consistently
Lots of watering
In Spring
Moderate
Moderate
In Winter
Ample Water
Average Water
Soil
Soil pH
Acidic
-
Soil Type
Loam, Sand
-
Soil Drainage Capacity
Well drained
-
Sun Exposure
Full Sun, Partial Sun
Full Sun, Partial Sun
Pruning
Prune after flowering, Remove dead or diseased plant parts, Remove deadheads, Remove short twigs
Remove damaged leaves, Remove dead branches, Remove dead leaves, Remove dead or diseased plant parts
Fertilizers
Apply 12-10-18 NPK, General garden fertilizer
All-Purpose Liquid Fertilizer
Pests and Diseases
Azalea leaf gall, Bud blast, Galls, Honey fungus, Leaf Hoppers, Leaf spot, Petal blight, Phytophthora, Powdery mildew, Rust, Silver leaf
Red blotch
Plant Tolerance
-
Drought
Flowers
Showy
Insignificant
Flower Petal Number
Single
-
Fruits
Showy Fruit
✔
✘
✔
✘
Edible Fruit
✔
✘
✔
✘
Fragrance
Fragrant Flower
✔
✘
✔
✘
Fragrant Fruit
✔
✘
✔
✘
Fragrant Leaf
✔
✘
✔
✘
Fragrant Bark/Stem
✔
✘
✔
✘
Showy Foliage
✔
✘
✔
✘
Showy Bark
✔
✘
✔
✘
Foliage Texture
Coarse
Medium
Foliage Sheen
Matte
-
Evergreen
✔
✘
✔
✘
Invasive
✔
✘
✔
✘
Self-Sowing
✔
✘
✔
✘
Attracts
-
Birds
Allergy
Asthma
Pollen
Uses
Aesthetic Uses
Showy Purposes
Borders
Beauty Benefits
Making cosmetics
-
Edible Uses
✔
✘
✔
✘
Environmental Uses
Air purification
Air purification, Shadow Tree, soil erosion prevension on hill slopes, Wildlife, Windbreak
Plant Benefits
Medicinal Uses
Burns, Chronic fatigue, Cold, Diarrhea, Dysentry, Headache, Rheumatism
Astringent, Diarrhea, Dysentry, Haemorrhages, Poultice, Sore Eyes, Sore throat
Part of Plant Used
Whole plant
Leaves, Seeds, Wood
Other Uses
Cosmetics, Employed in herbal medicine, Oil is used for aromatherapy, Oil is used in perfume, soaps, creams, etc., Sometimes used for making wine
Adhesive, Basketary, Buttons, Repellent, Tannin, Used as fuel, Used for woodware
Used As Indoor Plant
✔
✘
✔
✘
Used As Outdoor Plant
✔
✘
✔
✘
Garden Design
Feature Plant, Hedges, Mixed Border, Screening, Wind Break, Topiary, Bonsai, Espalier
Feature Plant, Shade Trees, Street Trees
Botanical Name
RHODODENDRON
QUERCUS douglasii
Common Name
Rhododendron
Blue Oak
In Hindi
rhododendron
Blue Oak Tree
In German
Rhododendron
Blaue Eiche
In French
rhododendron
Bleu Oak Tree
In Spanish
rododendro
Azul del árbol de roble
In Greek
ροδοδάφνη
Μπλε Oak Tree
In Portuguese
rododendro
Carvalho azul
In Polish
rododendron
Niebieski Oak Tree
In Latin
Rhododendron
Blue quercum ligno
Kingdom
Plantae
Plantae
Phylum
Magnoliophyta
Magnoliophyta
Class
Magnoliopsida
Magnoliopsida
Order
Ericales
Fagales
Family
Ericaceae
Fagaceae
Genus
Rhododendron
Quercus
Clade
Angiosperms, Asterids, Eudicots
Angiosperms, Eudicots, Rosids
Tribe
Rhodoreae
-
Subfamily
Ericoideae
-
Number of Species
102420
1
27800
👆🏻