How to Fertilize Japanese water iris 'Alpine Majesty'?
Balanced iris feed every three weeks in active spring and summer growth

Japanese water iris 'Alpine Majesty' · Iris ensata 'Alpine Majesty'
Grow in moist to wet, deep, humus-rich, neutral to acid soil in sun or part shade; it thrives at the margins of ponds or streams
Balanced iris feed every three weeks in active spring and summer growth