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Rhododendron 'Roseum Pink'

Roseum pink rhododendron

Ericaceae

Garden hybrid — one of the 'Ironclad' group of extremely cold-hardy rhododendrons

Attracts Pollinators Attracts Butterflies Attracts Hummingbirds

SunPart Shade

WaterMedium

HardinessZones 4–8

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

Identified by soft lavender-pink flower trusses fading to pink-white on a large evergreen shrub with dark green leathery leaves that curl downward in extreme cold. The leaf curling in cold is a normal defensive response. The Ironclad classification (zone 4 hardy) distinguishes it from less cold-tolerant rhododendrons.

Appearance

Size & Dimensions

Height6' - 10'

Width/Spread6' - 10'

Reaches mature size in approximately 10 years

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~3 weeks

Spring

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 trusses

Foliage Description

Dark green, large, leathery, evergreen — leaves CURL downward in extreme cold (a defensive response, not damage)

Growing Conditions

Sun Requirements

SunPartial Shade

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

Soil Requirements

pH Range4.5 - 6.0(Acidic)

357912

Soil Types

loam

Drainagewell drained

Water & Climate

Water Needs

Medium

Frost Tolerance

hardy

Time to Maturity

3-5 years

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

summer