Irises forum: When do you apply Preen?

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Name: Paul
Utah (Zone 5b)
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Paul2032
Mar 7, 2013 7:06 PM CST
I've been able to start cleaning some iris beds and have Preen I bought last year but didn't use. Iris are starting to green up. Shall I apply it now or wait a month? What do you do?
Paul Smith Pleasant Grove, Utah
Name: Lucy
Hamilton, MA (Zone 6b)
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irisarian
Mar 7, 2013 7:37 PM CST
My husband refuses to use it. Couldn't do it right now with the snow anyway.
Name: Arlyn
Whiteside County, Illinois (Zone 5a)
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crowrita1
Mar 7, 2013 7:39 PM CST
I do it as soon as I can. A lot of weed seed germinate in very cool weather.Then I re-treat in late May. ...Arlyn
Name: Mary Ann
Kentucky
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Muddymitts
Mar 7, 2013 7:49 PM CST
Yup -- if I'd had one more hour of free time today, that is the job I would have done. I'm gonna try for tomorrow......................
Thoughts become things -- choose the good ones. ([url=www.tut.com]www.tut.com[/url])
Name: Arlyn
Whiteside County, Illinois (Zone 5a)
Irises Beekeeper Region: Illinois Celebrating Gardening: 2015
crowrita1
Mar 7, 2013 8:36 PM CST
Just as soon as the snow's gone, it's my first job! Then as soon as the ice goes out, I'.ve got to pole a raft upstream to Wisconsin!...Arlyn Sticking tongue out
Name: Polly Kinsman
Hannibal, NY (Zone 6a)

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PollyK
Mar 13, 2013 12:52 PM CST
No reason you can't throw it right out on the snow if it's melting. It needs wet to work anyway.

Wish your husband would agree to use it, Lucy, it saves a lot of work, and I fell it's quite harmless.
Name: Rita
North Shore, Long Island, NY
Zone 6B
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Newyorkrita
Mar 15, 2013 12:32 PM CST
I use Preen right after I weed. You don't want the weeds to get started. The Preen doesn't kill any weeds that are growing, only works to stop new weeds from sprouting. So it makes most sence to me to apply it as soon as the iris bed is weeded.
Name: Lucy
Hamilton, MA (Zone 6b)
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irisarian
Mar 15, 2013 1:48 PM CST
Our main broblem is grasses in the iris beds.
Name: Lori Morrow
Enid, OK (Zone 6b)
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enidcandles
Mar 17, 2013 9:37 AM CST
Ornamec works great on the grasses. I use it here for the bermuda and it works wonders!
Name: Tom
Southern Wisconsin (Zone 5b)
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tveguy3
Mar 17, 2013 10:14 AM CST
Lori, I looked it up on line, and it's supposed to kill quack grass too, which is a major pain here. Do you know if it will Kill Iris? It says it's not effective on broad leaf plants. If it doesn't hurt the iris, It's would be worth its weight in gold, lol
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Name: Arlyn
Whiteside County, Illinois (Zone 5a)
Irises Beekeeper Region: Illinois Celebrating Gardening: 2015
crowrita1
Mar 17, 2013 10:22 AM CST
tom, I may be wrong, but aren't iris monocots( a grass)? If so, chem control of grassy weeds will be really hard to do....Arlyn
Name: Tom
Southern Wisconsin (Zone 5b)
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tveguy3
Mar 17, 2013 6:09 PM CST
Well, is sounds too good to be true, so I'm guessing it would kill the irises too.
I am not afraid of an army of lions led by a sheep; I am afraid of an army of sheep led by a lion. - Alexander the Great
Name: Arlyn
Whiteside County, Illinois (Zone 5a)
Irises Beekeeper Region: Illinois Celebrating Gardening: 2015
crowrita1
Mar 18, 2013 7:27 AM CST
I'm afraid it would. I don't use any weed "killers" in my beds, just pre-emergents.I tried to "wipe' some Roundup on quackgrass in a bed once, and it turned the grass yellow after 1 application, and I believe a 2nd would have killed it, but it also seemed to bother the iris that were next to it( fumes, I guess). So I went back to just digging it out!...Arlyn
Name: Mary Ann
Kentucky
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
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Muddymitts
Mar 18, 2013 9:13 AM CST
I used a grass killer on my Iris beds last year. It wasn't as successful with the grass as I would have liked -- maybe needed another application. But it didn't seem to bother the Irises at all. The product is out in the garage, so can't tell you what it was right now -- I'll try to remember to look later today.
Thoughts become things -- choose the good ones. ([url=www.tut.com]www.tut.com[/url])
Name: Polly Kinsman
Hannibal, NY (Zone 6a)

Charter ATP Member Region: United States of America I helped plan and beta test the plant database. I was one of the first 300 contributors to the plant database! Irises Lilies
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PollyK
Mar 18, 2013 9:15 AM CST
A lot of people use Ornamec in the iris garden with good success. I have a bottle, and have been afraid to try it.
Name: Lori Morrow
Enid, OK (Zone 6b)
I want them all!
Charter ATP Member I was one of the first 300 contributors to the plant database! Daylilies Irises Plant and/or Seed Trader Region: Oklahoma
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enidcandles
May 23, 2013 6:41 PM CST
Sorry it took so long to get back to you here! No, it will not kill your irises. I have used it many times with no problems. Use as directed and mix according to label and you will be fine. It is a great product that I refuse to live without!
Name: Polly Kinsman
Hannibal, NY (Zone 6a)

Charter ATP Member Region: United States of America I helped plan and beta test the plant database. I was one of the first 300 contributors to the plant database! Irises Lilies
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PollyK
May 24, 2013 12:35 PM CST
Ornamec, Lori?
Name: Lori Morrow
Enid, OK (Zone 6b)
I want them all!
Charter ATP Member I was one of the first 300 contributors to the plant database! Daylilies Irises Plant and/or Seed Trader Region: Oklahoma
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enidcandles
May 26, 2013 1:35 PM CST
Ornamec, yes.
Name: Polly Kinsman
Hannibal, NY (Zone 6a)

Charter ATP Member Region: United States of America I helped plan and beta test the plant database. I was one of the first 300 contributors to the plant database! Irises Lilies
Seller of Garden Stuff
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PollyK
May 26, 2013 6:12 PM CST
Thanks!

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