How to Fertilize English iris?
Low nitrogen feed in spring before and after bloom

English iris · Iris latifolia
Also known as: great bulbous iris; Pyrenean flag
Grow in moist but well-drained neutral or slightly alkaline soil, preferably in a sunny spot where the soil does not dry out. See bulb iris cultivation for further advice. May be naturalised in grass
Low nitrogen feed in spring before and after bloom