Life Span
Perennial
Perennial
Type
Tree
Broadleaf Evergreen
Origin
United States, California
-
Types
-
Rhododendron aberconwayi, Rhododendron bulu, Rhododendron kanehirae
Number of Varieties
8700
0
40000
👆🏻
Habitat
Woodland Garden Canopy
moist forests
USDA Hardiness Zone
6-95-8
0
99
👆🏻
AHS Heat Zone
9-1
-
Sunset Zone
3a, 3b, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
21,22
Habit
Spreading
Spreading
Plant Size
Minimum Height
1,520.00 cm150.00 cm
0
3900
👆🏻
Minimum Width
1,370.00 cm150.00 cm
0
6350
👆🏻
Plant Color
Flower Color
Red, Yellow green
Red
Flower Color Modifier
Bicolor
Bicolor
Fruit Color
-
Green, Tan
Leaf Color in Spring
Green, Blue Green
Green
Leaf Color in Summer
Green, Blue Green
Green
Leaf Color in Fall
Yellow, Orange, Pink
Green
Leaf Color in Winter
-
Green
Shape
Leaf Shape
Irregular
Ovate
Thorns
✔
✘
✔
✘
Plant Season
Spring, Summer, Fall, Winter
Spring, Summer, Fall, Winter
Growing Conditions
Sunlight
Full Sun, Partial Sun
Full Sun, Partial Sun
Growth Rate
Slow
Medium
Type of Soil
-
Loam, Sand
The pH of Soil
-
Acidic
Soil Drainage
-
Well drained
Bloom Time
Spring
Late Spring
Repeat Bloomer
✔
✘
✔
✘
Tolerances
Drought
-
Where to Plant?
Ground
Ground
How to Plant?
Seedlings
From Rhizomes, Seedlings, Stem Planting
Plant Maintenance
Medium
Medium
Watering Plants
Watering Requirements
Average Water Needs
Do Not over Water, Keep ground moist
In Summer
Lots of watering
Consistently
In Spring
Moderate
Moderate
In Winter
Average Water
Ample 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
Remove damaged leaves, Remove dead branches, Remove dead leaves, Remove dead or diseased plant parts
Prune after flowering, Remove dead or diseased plant parts, Remove deadheads, Remove short twigs
Fertilizers
All-Purpose Liquid Fertilizer
Apply 12-10-18 NPK, General garden fertilizer
Pests and Diseases
Red blotch
Azalea leaf gall, Bud blast, Galls, Honey fungus, Leaf Hoppers, Leaf spot, Petal blight, Phytophthora, Powdery mildew, Rust, Silver leaf
Plant Tolerance
Drought
-
Flowers
Insignificant
Showy
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
Medium
Coarse
Foliage Sheen
-
Matte
Evergreen
✔
✘
✔
✘
Invasive
✔
✘
✔
✘
Self-Sowing
✔
✘
✔
✘
Attracts
Birds
-
Allergy
Pollen
Asthma
Uses
Aesthetic Uses
Borders
Showy Purposes
Beauty Benefits
-
Making cosmetics
Edible Uses
✔
✘
✔
✘
Environmental Uses
Air purification, Shadow Tree, soil erosion prevension on hill slopes, Wildlife, Windbreak
Air purification
Plant Benefits
Medicinal Uses
Astringent, Diarrhea, Dysentry, Haemorrhages, Poultice, Sore Eyes, Sore throat
Burns, Chronic fatigue, Cold, Diarrhea, Dysentry, Headache, Rheumatism
Part of Plant Used
Leaves, Seeds, Wood
Whole plant
Other Uses
Adhesive, Basketary, Buttons, Repellent, Tannin, Used as fuel, Used for woodware
Cosmetics, Employed in herbal medicine, Oil is used for aromatherapy, Oil is used in perfume, soaps, creams, etc., Sometimes used for making wine
Used As Indoor Plant
✔
✘
✔
✘
Used As Outdoor Plant
✔
✘
✔
✘
Garden Design
Feature Plant, Shade Trees, Street Trees
Feature Plant, Hedges, Mixed Border, Screening, Wind Break, Topiary, Bonsai, Espalier
Botanical Name
QUERCUS douglasii
RHODODENDRON
Common Name
Blue Oak
Rhododendron
In Hindi
Blue Oak Tree
rhododendron
In German
Blaue Eiche
Rhododendron
In French
Bleu Oak Tree
rhododendron
In Spanish
Azul del árbol de roble
rododendro
In Greek
Μπλε Oak Tree
ροδοδάφνη
In Portuguese
Carvalho azul
rododendro
In Polish
Niebieski Oak Tree
rododendron
In Latin
Blue quercum ligno
Rhododendron
Kingdom
Plantae
Plantae
Phylum
Magnoliophyta
Magnoliophyta
Class
Magnoliopsida
Magnoliopsida
Order
Fagales
Ericales
Family
Fagaceae
Ericaceae
Genus
Quercus
Rhododendron
Clade
Angiosperms, Eudicots, Rosids
Angiosperms, Asterids, Eudicots
Tribe
-
Rhodoreae
Subfamily
-
Ericoideae
Number of Species
201024
1
27800
👆🏻