What's your question? Ask

Hyacinth Plant

Q.What will cause bearded Irises to stop booming?

Zone 4 | muggsie57 added on May 26, 2012 | Answered

My iris have performed well for years. Then they stopped blooming/ I divided them and they haven’t bloomed since. It’s been three years now. I started adding composted horse manure in my gardens two years ago. Could this be the problem?

A.Answers to this queston: Add Answer
Certified GKH Gardening Expert
Answered on May 28, 2012

The most common reason for irises failing to bloom is overcrowding. Dividing and transplanting them usually helps, but since this has not helped wtih yours, there may be other factors contributing to the lack of blooming.

Your soil may have an issue. Use a fertilizer higher in phosphorus or even a phosphorus only amendment, like bone meal, to get them to bloom. Since horse manure is high in nitrogen, it has likely thrown of the nutrient balance of your soil. This article will help you: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm

Failure to bloom can also be attributed to poor pollination. Try to entice pollinators (bees, butterflies, etc.) to the area with brightly colored flowers.

Was this answer useful?

Log in or sign up to help answer this question.

Did you find this helpful? Share it with your friends!

You must be logged into your account to answer a question.

If you don't have an account sign up for an account now.

Looking for more?
here are more questions about...
Hyacinth Plant
Join Us - Sign up to get all the latest gardening tips!

Do you know a lot about gardening?
Become a GKH Gardening Expert