Irises forum: Japanese iris not blooming

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Apr 30, 2016 10:33 AM CST
I have a large group of yellow Japanese iris. They are 6 feet tall and a healthy green. They have not bloomed for 3 years. The nearby Siberians are doing fine. What's up?
Name: Charlotte
Salt Lake City, Utah (Zone 6b)
genealogist specializing in French
Irises Region: Utah Hostas Bulbs Heucheras
Apr 30, 2016 12:03 PM CST
Welcome gwe. I have never grown Japanese, but just for the fact they have been growing for three years without blooming. tells me that they probably bloomed for three or more years prior to that. Which brings up the question of whether they are too crowded. I believe there are several on here who do grow Japanese, so expect you will get more comments.
Name: Mary Ann
I was one of the first 300 contributors to the plant database! Region: United States of America Hostas Hummingbirder Daylilies Birds
Irises Keeps Horses Region: Kentucky Farmer Container Gardener Celebrating Gardening: 2015
Apr 30, 2016 12:11 PM CST
Hi gwe!! Welcome to the Iris forum. I can't help you with your question -- I do not grow Japanese Irises. But the first thing that came to my mind also is *over-crowding*. Stick around -- you'll get answers from knowledgeable people!! Welcome!
Thoughts become things -- choose the good ones. (
Name: Leslie
Durham, NC (Zone 8a)
Region: North Carolina Irises Cat Lover Garden Photography Enjoys or suffers hot summers Celebrating Gardening: 2015
Apr 30, 2016 12:59 PM CST
Welcome! GWE

If they are a large clump, and have stopped blooming, then they need to be divided. When they get overcrowded they don't bloom as much, or at all.

This link of Chad Harris' gives a simple guide to thinning your japanese iris.
My road calls me, lures me west, east, south & north; most roads lead men homewards, my road leads me forth. - John Masefield

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