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Avatar for gwe
Apr 30, 2016 10:33 AM CST
Thread OP

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?
Avatar for cbunny41
Apr 30, 2016 12:03 PM CST
Name: Charlotte
Salt Lake City, Utah (Zone 7a)
genealogist specializing in French
Butterflies Bulbs Heucheras Hostas Irises Region: Utah
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.
Apr 30, 2016 12:11 PM CST
Name: Mary Ann
Western Kentucky (Zone 7a)
Bee Lover Irises Hummingbirder Hostas Keeps Horses Farmer
Daylilies I was one of the first 300 contributors to the plant database! Container Gardener Cat Lover Region: Kentucky Birds
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. (
Apr 30, 2016 12:59 PM CST
Name: Leslie
Durham, NC (Zone 8a)
Garden Photography Cat Lover Irises Region: North Carolina Peonies Enjoys or suffers hot summers
Celebrating Gardening: 2015
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.
"The chimera is a one time happenstance event where the plant has a senior moment and forgets what it is doing." - Paul Black
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