How to Fertilize Rhododendron 'Manderley'?
Ericaceous fertilizer monthly from spring through late summer

Rhododendron 'Manderley' · Rhododendron 'Manderley'
Grow in light dappled shade, in a site sheltered from cold, dry winds and late frosts, in moist but well-drained, humus-rich, acidic soil, preferably between pH4.5 and pH5.5; for more advice, see rhododendron cultivation
Ericaceous fertilizer monthly from spring through late summer