How to Fertilize Iris 'Sable Night'?
Diluted iris feed every three to four weeks during spring bloom

Iris 'Sable Night' · Iris 'Sable Night'
Thrives in a sunny position, in neutral to slightly acid soil with good drainage. Plant rhizomes just above soil level, as sun on the rhizomes encourages flowering. See bearded iris cultivation
Diluted iris feed every three to four weeks during spring bloom