How to Fertilize Iris prismatica?
Balanced iris feed every three weeks growing season

Iris prismatica · Iris prismatica
Thrives in moist, humus rich, ideally neutral to slightly acid soil. Will tolerate part shade but flowering is best in full sun. Suitable for planting at the edges of ponds and streams, in a bog garden, or in a border where the soil does not dry out
Balanced iris feed every three weeks growing season