How to Fertilize Iris 'Charming Billy'?
Potassium-rich iris feed biweekly prior to blooming onset

Iris 'Charming Billy' · Iris 'Charming Billy'
Grow in any moist but not waterlogged, neutral to slightly acidic soil in full sun or partial shade. In drier soils, dig in well-rotted manure before planting and apply as a mulch each spring
Potassium-rich iris feed biweekly prior to blooming onset