How to Fertilize iris 'Sea Power'?
Low nitrogen feed in spring before and after bloom

iris 'Sea Power' · Iris 'Sea Power'
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; sun on the rhizomes encourages flowering. Give a high potash feed in spring and divide every three to four years. See also bearded iris cultivation
Low nitrogen feed in spring before and after bloom