How to Fertilize iris 'Carnival Time'?
Diluted iris feed every three to four weeks during spring bloom

iris 'Carnival Time' · Iris 'Carnival Time'
Grow in well-drained, fertile, neutral to slightly acidic soil in full sun. Do not cover the rhizomes with mulch, or allow other plants to shade them. See also bearded iris cultivation
Diluted iris feed every three to four weeks during spring bloom