How to Fertilize Siberian iris 'Regency Belle'?
Low-nitrogen iris feed monthly spring before flower buds open

Siberian iris 'Regency Belle' · Iris 'Regency Belle'
Grow in any good garden soil that is preferably moist but not waterlogged. In drier soils, dig in well-rotted organic matter before planting then apply as a mulch each spring
Low-nitrogen iris feed monthly spring before flower buds open