Iris that grow from a rhizome, such as the Bearded Iris, are divided in the winter months or early spring in climates that are warm temperate. Iris that grow from bulbs, such as the Dutch Iris, are dug and divided when the foliage has died off after flowering, or any time until regrowth starts again.
Irises can be transplanted or divided in late summer. The reason for this is they are susceptible to bacterial soft rot and need the heat and dryness of late summer to prevent this. Also do not plant too deep or they will rot. The rhizome should be slightly exposed. Check for any soft spots on the rhizome. It could be soft rot or an iris borer, either way cut that part off of the rhizome with a sharp knife.
You separate Iris flowers when they do not bloom. This means they are in a "bunch" and need to be separated in order to produce blooms, not foliage.
In the fall.
Right after blooming in the spring or late summer/early fall.
You separate iris tubers in late August early September.
You should prune iris after they have flowered.
A good time is August when the iris is dormant.
You should cut the flower stalk but leave the leaves so the iris will rebloom next year.
Let the foliage go brown entirely before cutting it down.
Iris Dement. It is also on the record "Lifeline" that she released in 2004. Beautiful song. -d.hannon
It is used to cut soft tissue.
They don't last long however.
You can transplant the iris in late summer. If you don't want any more iris, mow them after they flower. But if you want the iris to come back again, don't mow them at all. The leaves need to gather more sunlight to be able to make more flowers.
The lines in the irises are called as the iris pigment epithelium and the iris stroma.
Iris plants spread by root. In the spring you can see this by noticing that the iris is producing a ring of new sprouts rather than from the center as planted originally. If divided (cut ring into for equal sections and replant) once in awhile the iris will live as long as you want. Each section can be planted in a new location in the garden.
Cut off the spent flower stems and leave the leaves.
If you cut down about 10 the volume goes down 5 if you cut 9 its 4 if you cut 8 its 3 if you cut 7 its 2 if you cut 6 its 1 But if you cut 5 or LESS No volume goes down!
Deadhead the flower unless you want the seeds. Every three years, you should thin the iris or it will stop blooming.
There are bearded iris, water iris, dwarf iris, Louisiana iris, and siberian iris. There is also blackberry iris.