How to Fertilize iris 'Gull's Wing'?
Diluted iris feed every three to four weeks during spring bloom

iris 'Gull's Wing' · Iris 'Gull's Wing'
Plant in any good garden soil that is moist but well-drained (not waterlogged); improve dry soils by digging in well-rotted organic matter and apply as a mulch each spring
Diluted iris feed every three to four weeks during spring bloom