How To Divide And Re-Plant Irises


Tall Bearded Iris grow well in northern temperate zones. Iris plants are hardy perennials that are easy to grow and care for in the right kind of environment.

For best results, Iris should be planted in July, August or September. The roots of newly planted Iris should be well-established before the growing season ends.

In areas with hot summers and mild winters, September or October planting may be preferred.

Iris need at least a half day of sun. In extremely hot climates, some shade is beneficial, but in most climates Iris do best in full sun. Be sure to provide your Iris with good drainage, planting either on a slope or in raised beds.

Dividing Irises

Iris need to be thinned or divided before they become overcrowded, generally every 3-4 years. If Iris are allowed to become too crowded the bloom will suffer, some varieties may crowd others out and disease problems may be aggravated.

  • Old clumps may be thinned by removing the old divisions at the centres of the clumps and leaving new growth in the ground.
  • Or, you may dig up the entire clump and remove and replant the large new rhizomes.

iris850 slim

General Garden Care

  • Keep your Iris beds free of weeds and debris, allowing the tops of the rhizomes to bask in the sun.
  • Bloom stems should be cut off close to the ground after blooming.
  • Healthy green leaves should be left undisturbed, but diseased or brown leaves should be removed.