How to Fertilize tall bearded iris 'Godfrey Owen'?
Diluted iris feed every three to four weeks during spring bloom

tall bearded iris 'Godfrey Owen' · Iris 'Godfrey Owen'
Plant in full sun in well-drained soil, and with the top surfaces of the rhizomes exposed so that they get baked in summer sun, which encourages flowering. See also bearded iris cultivation
Diluted iris feed every three to four weeks during spring bloom