How to Fertilize American rosebay?
Ericaceous fertilizer monthly from spring through late summer

American rosebay · Rhododendron maximum
Also known as: great laurel
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
Ericaceous fertilizer monthly from spring through late summer