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The best time to plant iris bulbs

Updated July 19, 2017

There are nearly 300 species of iris, many of which are popular in home gardens and landscapes. Proper planting is essential to growing irises successfully, and knowing when to plant the rhizomes is basic to correct planting.

Summer planting

The ideal months for planting irises are July, August and September. When planted in these summer months, the plants develop a healthy root system in time for facing the cold months ahead.

Plant dividing

After blooming in spring, irises can be dug and divided, making more plants for next season. Summer is also the optimum time for replanting newly divided rhizomes.

Spring planting

Although planting irises in summer and autumn is preferable, many people do plant them in the spring, when the garden centres stock up on iris rhizomes. However, when planted in spring, irises might not bloom the first year.

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About the Author

Mitzi McAdam began writing in 2002. Her work has appeared in various online publications. McAdam specializes in landscape design and gardening. McAdam holds a Bachelor of Arts in interdisciplinary studies from Armstrong Atlantic State University.