How to Plant Blue Dutch Iris in Containers

Fill the container with a good-quality organic commercial potting mix. Water thoroughly and allow to drain. Check to make sure the container drains well, as iris are prone to rot in waterlogged soil. Place the container on its drip pan.

Set the container in a location where it receives full sun. Avoid any location where the container could cause water damage if it overflows.

Dig one hole for each iris bulb. Dig the holes 2 inches deep and 3-4 inches apart. Dig five holes for an 8-inch pot, seven holes for a 10-inch pot and nine holes for a 12 to15-inch pot. Plant one bulb in each of the holes, taking care to set the bulb with the wide end down and the pointed end facing upward. Backfill with soil to cover the bulbs.

Water thoroughly, soaking the container. Allow to drain, and empty the drip pan if full. Leaves will begin to sprout in the fall in warm regions, grow throughout the winter and bloom in the spring. In colder climates, foliage and flowers won't grow during the winter, but still develop in the spring. Water the plants throughout the blooming cycle. Cut the blooms at any time for flower arrangements.

Allow the foliage to stay in place after the flowering season is over. Do not remove the leaves, as the plant needs them to continue gathering sunlight and nutrients for the next year's growing season.

Remove the leaves when they yellow and die back to the base of the bulb. When the leaves have died back the plant will go dormant. Do not water the bulbs during this dormant season. The bulbs will rest for a few months and then begin a new growing cycle.