iris 'Concertina'

Grow in well-drained, fertile, neutral to slightly acidic soil in full sun. Do not cover the rhizomes with mulch, or allow other plants to shade them, as sun on the rhizomes encourages flowering. Give a high-potash feed in spring and divide every three to four years. See bearded iris cultivation

Old flower stems can be cut down after flowering; remove any dying foliage in autumn

Propagate by division of rhizomes from midsummer to early autumn, see Dividing irises

May be susceptible to slugs, snails and thrips

May be susceptible to iris rhizome rot, a leaf spot and a virus