How to Fertilize Siberian iris 'Fourfold White'?
Low-nitrogen slow-release feed twice yearly spring and mid-autumn
Siberian iris 'Fourfold White' · Iris 'Fourfold White'
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 slow-release feed twice yearly spring and mid-autumn