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Irises: Help with knowing when to divide Iris

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michigan420
Muskegon, MI
(Zone 6a)

July 2, 2011
7:30 PM

Post #8668866

I'm new to Iris growing but getting the addiction fast! I've read that you should divide them every couple of years but then I see pictures of great big clumps of them that are blooming beautifully so it has me confused. Are the rhizomes being divided and then planted nearby for a large clump? Help, please! Thanks...I've up loaded a photo of some I planted which are on their third summer..do they look like they should be divided? Thank you very much to anyone who can help me figure this out...

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irisMA

irisMA
South Hamilton, MA

July 2, 2011
7:40 PM

Post #8668876

They look fine. When the clumps start growing into each other, it shows that division would be needed.
michigan420
Muskegon, MI
(Zone 6a)

July 2, 2011
7:43 PM

Post #8668883

Thank you, Iris MA! One of the clumps didn't bloom at all though...should that tell me something?

irisMA

irisMA
South Hamilton, MA

July 3, 2011
7:29 AM

Post #8669410

that one might need division or just might be planted too deeply. Is it planted deeper than the others? or in a too shaded position? or a different cultivar?
michigan420
Muskegon, MI
(Zone 6a)

July 3, 2011
9:27 AM

Post #8669643

No same cultivar and gets tons of sun. I'll check the depth. Thank you for all your input!
redheadclan
Vail, AZ

July 4, 2011
7:21 AM

Post #8671299

I agree that the one second from the right needs dividing. I have a good article on dividing iris on my web site, irismelodies.com
estrail1rider
Melfa, VA
(Zone 8a)

July 5, 2011
4:21 AM

Post #8673091

I also have big clumps containing more than 15 rhizomes and more...I quit counting after 15. They have grown so much faster at their new home than at their old one. The rhizomes are also much bigger. I am thinking they should be divided in maybe Aug? zone 7b maybe 8.
caitlinsgarden
McGregor, IA
(Zone 4b)

July 5, 2011
4:42 AM

Post #8673118

For me, they need to be divided when the rhizomes start climbing all over each other and can't live in the sun and air. This leads to rot in my experience. I only recently figured out which end of the rhizome needs the room to grow out - I used to plant them will-nilly and they got crowded very early.

irisMA

irisMA
South Hamilton, MA

July 5, 2011
7:40 AM

Post #8673419

Dividing depends on where they are going; other places in your garden or someone else's gaden. They should be able to be divided later in your climate. Here we like them in or out in July. We have some to dig as soon aspossible, but not in today's heat. 82 now & will get warmer. grocery shopping first.
michigan420
Muskegon, MI
(Zone 6a)

July 5, 2011
7:04 PM

Post #8674843

Thanks to all for your help!
estrail1rider
Melfa, VA
(Zone 8a)

July 6, 2011
4:39 AM

Post #8675417

TY from me, too!
Deb

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