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Rhododendron 'Horizon Monarch'View more from Rhododendron
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The Horizon Monarch Rhododendron is one of the most striking yellow-flowering rhododendrons available, producing large rounded flower clusters in soft creamy yellow with vivid deep red throats and delicate salmon-pink frilled edges. Blooming in mid-spring, the flowers emerge from scarlet buds and create an unforgettable display against rich dark green evergreen foliage. Growing into a broad upright shrub about 5 to 6 feet tall and wide, this vigorous hybrid brings elegant color and year-round structure to woodland gardens, shaded borders, and foundation plantings. Award-winning and easy to grow, it thrives in partial shade and moist acidic soil, delivering exceptional beauty with very little maintenance.
The Horizon Monarch Rhododendron grows best in partial shade or filtered sunlight with protection from hot afternoon sun. Plant it in moist, acidic, well-drained soil enriched with organic matter, and mulch regularly to help maintain cool root conditions. Water consistently during dry periods, especially while establishing, but avoid soggy soil. Minimal pruning is needed beyond light shaping after flowering, and established plants are generally resistant to pests and deer.

Botanical Name:
Rhododendron 'Horizon Monarch'
Mature Width:
5-6 ft
Mature Height:
5-6 ft
Grows Well In:
Zones 5-8

Sun Needs:
Partial Sun, Shade
Water Needs:
Moderate
Growth Rate:
Medium
Flower Color:
Pink, Red, Yellow
Flowering Season:
Spring