rhododendron 'Johanna'

Grow in moist but well-drained, leafy, humus-rich acid soil in a sheltered position in part shade, sun tolerant if soil is reliably moist; see rhododendron cultivation

Propagate by semi-ripe cuttings in late summer, layering in autumn or grafting in late summer or late winter

May be attacked by vine weevil, rhododendron leafhopper, pieris lacebug, scale insects, caterpillars and aphids

May be affected by various Rhododendron diseases including powdery mildews, rhododendron petal blight, rhododendron bud blast, silver leaf and honey fungus