Iris bulbs should be planted in the fall for spring blooms. For best results, blooms need at least a half day of full sun, but colors will be more vibrant if they receive a full day of direct sunlight. Soil should be well-drained at all times.

How late can you plant iris bulbs?

Ideally, plant irises in late summer to early fall, when nighttime temperatures remain between 40 and 50 degrees Fahrenheit or above.

Should you soak iris bulbs before planting?

It would be wise to soak iris in a diluted solution (1-9 ratios) of bleach and water for several hours or even overnight before replanting the large new healthy rhizomes. If planting in the fall when dormant, one may wish to cut back existing roots to about three inches.