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

Japanese water iris 'Loyalty' · Iris ensata 'Loyalty'
Grow in moist to wet, deep, humus-rich, acid soil, plant rhizomes 7.5cm deep; it thrives at the margins of ponds or streams, but avoid winter waterlogging
Balanced iris feed every three weeks in active spring and summer growth