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Rhododendron 'Rosa Mundi'
Rosa Mundi rhododendron
Overview
Rhododendron 'Rosa Mundi' is an evergreen shrub reaching 4–5 feet (1.2–1.5 m) tall and 4–5 feet (1.2–1.5 m) wide, with a dense rounded compact habit. The cultivar is an elepidote rhododendron carrying a two-tone flower pattern: soft pink petals with a prominent golden-bronze to amber flare 0.5–0.8 inch (13–20 mm) across on the upper petals, producing a warm-cool color combination within each individual flower. Trusses are rounded and hold 12–16 funnel-shaped flowers 2–2.5 inches (5–6 cm) wide, borne in May–June over a 3–4 week window on the previous year's wood. Leaves are simple, alternate, elliptic, 4–5 inches (10–13 cm) long, glossy dark green, leathery, held year-round. Growth rate is moderate; the shrub reaches full mature size in 8 growing seasons. Hardy to USDA zone 6. All parts of the plant contain grayanotoxins and are toxic to pets and humans if ingested.
Native Range
Rhododendron 'Rosa Mundi' is a hybrid cultivar of garden origin, bred from crosses involving large-leaved elepidote Rhododendron species of the Ponticum subgenus.Suggested Uses
Used in mixed perennial borders, woodland garden plantings, north- or east-facing foundation beds, or large containers at 4–5 foot (1.2–1.5 m) spacing. The two-tone soft-pink-with-golden-bronze-flare flower color reads as a warm-cool combination in mid-spring plantings, giving each flower the visual complexity of a multicolored pattern without requiring multiple cultivars to achieve the effect. Underplanting with chartreuse-foliage shade perennials such as Hosta 'Sum and Substance' or Hakonechloa macra 'Aureola' extends the warm-toned color palette at ground level through the growing season. The plant does not grow well in alkaline soils above pH 6.5, full sun in USDA zones 7 and warmer, dry positions, or climates below USDA zone 6.How to Identify
Appearance
Size & Dimensions
Height4' - 5'
Width/Spread4' - 5'
Bloom Information
Detailed Descriptions
Flower Description
Soft pink with prominent golden-bronze to amber upper-petal flare 0.5-0.8 inch across; funnel-shaped 2-2.5 inches in rounded trusses of 12-16; May-June on previous year's woodFoliage Description
Glossy dark green; simple, alternate, elliptic, 4-5 inches long, leathery; evergreen year-roundGrowing 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
Grow in partial shade with 3–6 hours of direct or filtered morning light in moist, well-drained, acidic loam, peat, or sandy loam at pH 4.5–6.0. The pH requirement is strict — soils above pH 6.0 cause iron and manganese chlorosis that yellows foliage and slows growth. Apply 3–4 inches (8–10 cm) of organic mulch over the root zone in spring to retain soil moisture and keep the shallow fibrous root system cool. Water deeply once per week during dry periods from April through September; drought stress produces leaf-tip browning and bud drop within 10–14 days. Hardy to USDA zone 6.Pruning
Deadhead spent flower trusses after bloom in late June or early July by snapping them off at the base with thumb and forefinger above the developing growth buds. The dense rounded habit develops naturally without shaping cuts. Structural pruning when needed should take place immediately after flowering, before new growth buds extend.Pruning Schedule
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summer
Container Growing
Suitable for container growing
Minimum container size: 5 gallons