How to Fertilize Siberian flag?
Balanced iris feed every three weeks in active spring and summer growth
Siberian flag · Iris sibirica
Also known as: Siberian iris
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
Balanced iris feed every three weeks in active spring and summer growth