What Are the Sunlight Requirements for Rhododendron serotinum?
Partial shade

Rhododendron serotinum · Rhododendron serotinum
Grow in moist but well-drained, humus rich, acidic soil, in partial or dappled shade. Choose a site away from frost pockets and sheltered from strong winds, and do not allow plants to dry out. Mulch annually, ideally with leaf mould. See rhododendron cultivation for more detailed advice
Partial shade