How to Fertilize rhodora?
Azalea acid fertilizer every four weeks active growing season

rhodora · Rhododendron canadense
Grow in moist but well-drained, humus rich, acidic soil, in sun or light shade. Choose a site away from frost pockets and sheltered from strong winds. Mulch annually, ideally with leaf mould. See rhododendron cultivation for more detailed advice
Azalea acid fertilizer every four weeks active growing season