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© Photo by David J. Stang, some rights reserved (CC-BY-SA) · Wikimedia Commons
Overview
Rhododendron 'Roseum Pink' is a cold-hardy large-leaf rhododendron, growing 72–120 inches (180–300 cm) tall and 72–96 inches (180–240 cm) wide. Soft lavender-pink flower trusses 4–5 inches (10–13 cm) across fading to pink-white in late spring. Classified as an 'Ironclad' — a group of large-leaf rhododendrons that survive zone 4 (−25°F / −32°C) without winter protection. Large dark green leathery evergreen leaves 4–6 inches (10–15 cm) long curl downward in extreme cold — this is a normal defensive response that reduces exposed leaf surface area and prevents desiccation; the leaves unfurl when temperatures warm. Requires acidic soil (pH 4.5–6.0) — iron chlorosis (interveinal yellowing) develops in alkaline conditions. All parts contain grayanotoxins — toxic to humans and animals if ingested. Honey produced from rhododendron nectar can contain grayanotoxins ('mad honey'). Deer may browse the foliage despite the toxicity. Zones 4–8. Morning sun with afternoon shade. Well-draining acidic soil. Shallow root system — mulch with 2–3 inches (5–7 cm) of acidic material (pine bark, pine needles). Lace bugs are the primary pest. Phytophthora root rot in waterlogged conditions.
Native Range
'Roseum Pink' is a garden hybrid in the 'Ironclad' cold-hardy group.Suggested Uses
Grown as a specimen, screen, or woodland-edge plant in zones 4–8, spaced 72–96 inches (180–240 cm) apart. Morning sun with afternoon shade. Acidic soil required. The zone 4 hardiness extends rhododendron planting into cold-winter regions. Toxic — all parts.How to Identify
Appearance
Size & Dimensions
Height6' - 10'
Width/Spread6' - 10'
Reaches mature size in approximately 10 years
Colors
Bloom Information
Late spring (May–June). Lavender-pink trusses fading to pink-white. Deadhead spent trusses to promote next year's bud formation. Blooms on old wood.Detailed Descriptions
Flower Description
Soft LAVENDER-PINK, fading to pink-white, in large rounded trussesFoliage Description
Dark green, large, leathery, evergreen — leaves CURL downward in extreme cold (a defensive response, not damage)Growing Conditions
Sun Requirements
Requires 3-6 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
Morning sun / afternoon shade. Acidic soil pH 4.5–6.0 required. Well-draining — Phytophthora root rot in wet conditions. Mulch with acidic material. Leaf curling in extreme cold is normal. Toxic (grayanotoxins). Lace bugs. Zone 4 hardy.Pruning
Deadhead spent flower trusses after bloom. Prune for shape after flowering. Blooms on old wood — late pruning removes next year's buds. Can be rejuvenated by cutting to 12 inches (30 cm) — regrowth takes 2–3 years to rebloom.Pruning Schedule
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