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Rhodendron Horizon Monarch
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Frank Organ added this to 16 Stunners From an English Garden Center
For a larger, spreading rhododendron, R. 'Horizon Monarch' is a great late spring variety. It produces bright red to pink buds in mid-May to early June, which open to large clusters of funnel-shaped, pale yellow flowers with small red flares. This all occurs against a background of leathery, elliptical, dark green leaves.