1 / 2
Daderot, no rights reserved (CC0) · Wikimedia Commons
Overview
Rhododendron 'Fred Peste' is an evergreen shrub in the heath family (Ericaceae) reaching 4–6 feet (1.2–1.8 m) tall with a spread of 4–6 feet (1.2–1.8 m), carrying a dense rounded upright habit. The cultivar is an elepidote (large-leaved) rhododendron and produces rounded flower trusses of 12–16 funnel-shaped flowers 2–2.5 inches (5–6 cm) wide in deep red to crimson-red tones — the color runs as one of the truer deep-red tones across the large-leaved rhododendron cultivar group. The flowers hold their red color across the bloom window without shifting toward purple or blue undertones as they age, which is atypical behavior in red-flowered rhododendrons where color drift toward purple tones is common. The elliptic leaves run 4–6 inches (10–15 cm) long, glossy dark green in color, leathery in texture. Growth rate runs moderate. Hardy to zone 5. Named after Fred Peste, a Pacific Northwest rhododendron enthusiast and breeder.
Native Range
Rhododendron 'Fred Peste' is a hybrid of garden origin, named for a Pacific Northwest rhododendron enthusiast and introduced into commercial cultivation through the regional rhododendron trade.Suggested Uses
Grown in mixed-shrub borders or in woodland garden compositions at 4–5 foot (1.2–1.5 m) spacing. The deep crimson-red flower color that holds across the bloom window without purple shift runs as the primary ornamental distinction — color retention is atypical across red-flowered rhododendron cultivars. Afternoon shade in exposed garden positions matters for peak flower color saturation across the bloom phase. Alkaline soils, full-sun positions, and dry sites without irrigation support are all unsuitable given the cultural profile.How to Identify
Appearance
Size & Dimensions
Height4' - 6'
Width/Spread4' - 6'
Reaches mature size in approximately 8 years
Bloom Information
Rounded flower trusses of 12–16 funnel-shaped deep red to crimson-red flowers 2–2.5 inches (5–6 cm) wide open during the May to June bloom window. Flower color holds across the 3- to 4-week bloom window without shifting toward purple or bluish undertones, which is atypical behavior in red-flowered rhododendrons where color drift toward purple tones is common across the aging flower phase.Detailed Descriptions
Flower Description
Deep red to crimson-red funnel-shaped flowers 2-2.5 inches across in rounded trusses of 12-16 flowers during May to June; color holds without shifting toward purple or bluish undertonesFoliage Description
Glossy dark green leathery elliptic leaves 4-6 inches long held year-round across the canopyGrowing 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
Grows in partial shade in moist well-drained acidic soil at pH 4.5–6.0, tolerating loam, peat, and sand substrates. Hardy to zone 5. Hot afternoon sun in exposed positions can cause flower bleaching across the bloom window — red-flowered rhododendrons run more vulnerable to sun bleaching than white or pink cultivars, and siting with afternoon shade or under light high canopy shade in exposed locations reduces the bleaching risk and carries peak color saturation across the bloom phase. Mulching maintains cool moist root-zone conditions across the growing season.Pruning
Spent flower trusses are removed by snapping them off above the developing growth buds after the bloom phase ends to direct energy into next-year flower bud formation. Routine pruning runs minimal because the dense rounded form develops naturally without structural intervention.Pruning Schedule
J
F
M
A
M
J
J
A
S
O
N
D
summer
Maintenance Level
moderateContainer Growing
✓ Suitable for container growing
Minimum container size: 5 gallons