How to Fertilize commonName:"rhododendron 'Cosmopolitan'"?
Ericaceous feed in spring and lightly after bloom

commonName:"rhododendron 'Cosmopolitan'" · Rhododendron 'Cosmopolitan'
Grow in moist but well-drained, humus rich acid soil in a sheltered position in part shade; see rhododendron cultivation
Ericaceous feed in spring and lightly after bloom