How to Water Rhododendron 'Royal Command'?
Keep acidic root zone moist and cool, never soggy

Rhododendron 'Royal Command' · Rhododendron 'Royal Command'
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; will also tolerate sun and dry soil; for more advice, see rhododendron cultivation
Keep acidic root zone moist and cool, never soggy