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Rhododendron quinquefolium
quinquefolium azalea
Japan (Honshu and Shikoku); montane deciduous forests at 2,000–6,000 feet (600–1,800 m)Learn more
Overview
Rhododendron quinquefolium is a deciduous azalea native to Japan, grown for its refined foliage arrangement and spring flowers. Shrubs reach 6–12 feet (1.8–3.7 m) tall and 5–10 feet (1.5–3 m) wide at maturity over many years; growth rate is slow, 4–8 inches (10–20 cm) per year. The habit is upright and openly branched with a somewhat tiered appearance. The most distinctive feature is the foliage: leaves are arranged in whorls of 5 at the branch tips, each leaf 1–2.5 inches (2.5–6.3 cm) long, rhombic to obovate, with margins fringed with fine hairs. New foliage in spring is edged with reddish-purple, transitioning to green, and turning orange to deep red in autumn. Flowers appear in April–May as the leaves are expanding: 1–3 per cluster at branch tips, broadly funnel-shaped, white with green or olive-green spots on the upper lobe, 1.2–1.6 inches (3–4 cm) across. The combination of 5-whorled leaves, white spotted flowers, and strong fall color distinguishes this from most other azaleas in cultivation. All parts are toxic to humans and animals if ingested.
Native Range
Rhododendron quinquefolium is native to Japan, occurring in montane deciduous forests on Honshu and Shikoku, typically at elevations of 2,000–6,000 feet (600–1,800 m). It is not native to the Pacific Northwest.Suggested Uses
Planted as a specimen or understory shrub in woodland gardens, Japanese-inspired gardens, and sheltered borders, spaced 5–7 feet (1.5–2.1 m) from adjacent plants. The 5-whorled leaf arrangement, white spotted spring flowers, and strong fall color provide three seasons of interest. Best suited to partly shaded, moist, acidic west-side Pacific Northwest conditions.How to Identify
Appearance
Size & Dimensions
Height6' - 12'
Width/Spread5' - 10'
Reaches mature size in approximately 12 years
Bloom Information
Flowers appear in April–May as leaves are expanding. Each cluster produces 1–3 broadly funnel-shaped, white flowers 1.2–1.6 inches (3–4 cm) across with green or olive-green spots on the upper lobe. Stamens are 5, equal in length to the style. The bloom period lasts 2–3 weeks.Detailed Descriptions
Flower Description
white with green spots on upper lobeFoliage Description
new growth red-purple edged, maturing to green; orange to deep red fall colorGrowing Conditions
Sun Requirements
Requires 2-6 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight
Care & Maintenance
Care Guide
Water weekly during the first two growing seasons; established shrubs require consistent moisture and do not tolerate drought. Prefers cool, moist, acidic, well-drained soils with high organic matter; shallow-rooted and sensitive to soil compaction. Partial shade is recommended — direct afternoon sun bleaches flower color and stresses plants. Mulch with 2–3 inches (5–7.5 cm) of wood chips to maintain soil moisture and moderate temperature. No serious pest or disease problems in cool Pacific Northwest conditions. All parts are toxic to humans and animals if ingested.Pruning
Prune immediately after flowering to preserve the following year's buds. The open, tiered habit requires minimal pruning. Remove dead or damaged branches at any time. Hard rejuvenation pruning is tolerated but sets back flowering for 2–3 years.Pruning Schedule
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F
M
A
M
J
J
A
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O
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D
late spring