Use a spade or fork to dig up your iris clumps and wash them off well with a hose until you have removed all dirt and can easily see where the rhizomes (rzs) are attached to one another.
faq.gardenweb.com/faq/lists/iris/2002045002020707.html faq.gardenweb.com/faq/lists/iris/2002045002020707.html
Q: I am moving to another house, so I want to dig up some iris bulbs and take them with me. Do I need to replant them right away or wait until spring? (e-mail reference)
www.ext.nodak.edu/extnews/hortiscope/flowers/iris.htm www.ext.nodak.edu/extnews/hortiscope/flowers/iris.htm
To ensure a good bloom, we recommend thinning iris clumps every three or four years. In the late summer, dig up the clump, separate the new rhizomes, and replant.
www.schreinersgardens.com/about_iris.shtml www.schreinersgardens.com/about_iris.shtml
iris bulbs, rhizomes, rhizome: Dig up clumps of iris rhizomes in late summer and cut the new growth from the center ( old growth ). Then replant the new growth spaced 6-8 apart on center. Iris clumps make star-shaped growth. ... Question when & how to dig up Iris bulbs and divide? Answer; Dig up clumps of iris rhizomes...
en.allexperts.com/q/Bulbs-709/dig-Iris-bulbs-divide.htm en.allexperts.com/q/Bulbs-709/dig-Iris-bulbs-divide.htm
     When you dig and replant an older iris bed, it is  good to dig and put in separate places, with the name tag, on each clump. When replanting, divide the clumps  and save at least 3 nice rhizomes and put them, toes together, in a close clump and let them multiply from that position.
sites.google.com/site/sandiegoirissociety/iris-links/ir... sites.google.com/site/sandiegoirissociety/iris-links/iris-nooz-by-leon-vogel
Hi Kim: With so many iris I think it would be dificult if not impossible to dig, bleach, replant 10,000 iris. This is probably only practical with a small garden. Have you actually seen the borers? How many of your iris are infested?
forums.gardenweb.com/forums/load/iris/msg0608214429214.... forums.gardenweb.com/forums/load/iris/msg0608214429214.html
You will likely dig up several iris bulbs that are stuck together. This is fine. Once you have the iris bubls out of the ground, separate them gently using your hands. Do not pull the roots apart as this could break the roots. ... eHow Article: How to Replant Irises and Iris Bulbs...
www.ehow.com/how_5337293_replant-irises-iris-bulbs.html www.ehow.com/how_5337293_replant-irises-iris-bulbs.html
1. Dig the Clump ... 4. Replant the divisions; Always plant bearded irises in a sunny location with good drainage. First check for any borer pup ae in the soil if you are replanting in the same location. Destroy them, or they will emerge in fall as moths and lay eggs on or near the new plantings.
www.daytonnursery.com/tips/Dividing%20Iris.htm www.daytonnursery.com/tips/Dividing%20Iris.htm
A thread in the Irises forum, titled Dig, divide and replant? ... My Iris show no sign of borer, can they be replanted in the same area? Plan to add to the soil, anything special, or just compost?
davesgarden.com/community/forums/t/629409/
To divide the iris, dig up the clump using a spading fork or loosen soil all around and under the clump [2], taking care not to cut the rhizomes growing near the outer edge. Lift the entire clump out of the ground and clean off any soil clinging to the rhizomes. ... Replant the iris in a sunny location with good drainage.
www.mrs.umn.edu/pyg/tips/perennials/tip_621.shtml
Definitions