Only 60-75% of Iris bloom the first year after planting. Sometimes they need an extra year to become established. Unusual weather conditions or late spring frosts can also harm Iris blooms. ... Several varieties of Bearded Iris have been known to rebloom after the initial spring bloom season.

How long does it take for iris to flower?

Light: Irises need at least six hours to bloom properly. Crowding: As the rhizomes multiply, the clump can become overcrowded. Crowded irises often refuse to bloom.

What do I do if my irises don't bloom?

It may be a good idea to divide and replant your irises. Find a sunny location receiving at least 6 hours of direct sunlight each day. Prepare the planting site by digging the soil deeply to loosen compacted soil. As you are turning the soil, add amendments such as compost and a phosphate fertilizer.