Irises forum: Siberian Iris - need regular dividing?

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Name: Sharon
McGregor IA (Zone 4b)
Jun 27, 2014 5:36 AM CST
My SIBS seem to have diminished in blooms and growth. Could it be that they are too crowded? Should they be divided every few years?
Name: Greg Hodgkinson
Hanover PA (Zone 6b)
Charter ATP Member Irises I was one of the first 300 contributors to the plant database! Region: Pennsylvania Region: Japan Garden Photography
Jun 27, 2014 8:45 AM CST
Not as often as TB's but yes, they need to be divided.
Name: Sharon
McGregor IA (Zone 4b)
Jun 27, 2014 1:50 PM CST
Best to do in the spring or in the fall?
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
Jun 28, 2014 8:09 AM CST
Spring or fall is fine. You usually notice some dying out int the middle of the clump when it's time to divide, but for your backs sake I recommend every three years at most.
Name: Sharon
McGregor IA (Zone 4b)
Jun 28, 2014 11:15 AM CST
Thanks; I know its been much more than 3 years, my poor back...
Name: Lucy
Hamilton, MA (Zone 6b)
Charter ATP Member Cottage Gardener Enjoys or suffers cold winters Region: United Kingdom Region: Northeast US Irises
Region: United States of America
Jun 28, 2014 11:29 AM CST
yes, after 3 years they are tough to work with.
Name: Carl Boro
Milpitas, CA (Zone 10b)
Celebrating Gardening: 2015 Photo Contest Winner: 2015
Jun 28, 2014 11:58 AM CST
Siberian iris are usually dug in the fall in milder climates. One thing to remember if you are going to give the extras away is to keep the roots damp. If the roots dry out, the plant will die. The growers who mail them use the polymer crystals that absorb water to keep them wet while in the mail. If you are just giving them to friends you can wrap the roots in a wet paper towel and then put them in a plastic bag. Leave the leaves out of the bag. They can be put in the refrigerator for a week or two if you need the time to redig the bed. Don't trim the roots when you plant them.
Name: Bonnie Sojourner
Harris Brake Lake, Arkansas (Zone 7a)
Magnolia zone
Region: United States of America Region: Arkansas Master Gardener: Arkansas Irises Plant and/or Seed Trader Moon Gardener
Garden Ideas: Master Level Dragonflies Bulbs Garden Art Celebrating Gardening: 2015 Gardens in Buckets
Jun 28, 2014 1:00 PM CST
thank you for the info Carl. I have gotten LA irises at our plant sale and swaps and the roots are always enclosed tightly in a little bag with water in it. I bring them home and put them in water until I can get them planted. They must like it as they bloom the next year.
Who plants a seed beneath the sod and waits for growth believes in God. ~~Unknown
Name: Leslie
Durham, NC (Zone 8a)
Region: North Carolina Irises Cat Lover Garden Photography Enjoys or suffers hot summers Celebrating Gardening: 2015
Jun 29, 2014 12:39 PM CST
The LA iris I have had shipped to me also had bags of water around the roots, then the plants were rolled in paper to keep from breaking, then put in the cardboard box.
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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