How to Fertilize iris 'Knick Knack'?
Diluted iris bulb feed every three to four weeks spring blooming season

iris 'Knick Knack' · Iris 'Knick Knack'
Grow in well-drained, preferably neutral to alkaline soil in full sun but acid soils are tolerated if well-drained. Sun on the rhizomes will encourage flowering. See also bearded iris cultivation
Diluted iris bulb feed every three to four weeks spring blooming season