How to Fertilize iris 'Rowden Sonata'?
Balanced iris feed every three weeks during active spring and summer growth

iris 'Rowden Sonata' · Iris versicolor 'Rowden Sonata'
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 during active spring and summer growth