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

Japanese water iris 'Moonlight Waves' · Iris ensata 'Moonlight Waves'
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