I just cut back about 1/2 of our irises on a hillside and just saw an article that I may be cutting them back too much. I thought you could cut the leaves back to 1 inch or so when also digging out and transplanting some of the rhizomes. Sharron Lee August 8, 2016 Kenmore, WA 98028 slingham1@aol.com
Iris plants are pretty darn tough. Cutting to 1 inch is severe, however. I try to lift, divide and transplant soon after blooming is over and cut leaves to 9 inches. In general, however, you should leave the leaves intact until they naturally start yellowing in fall. As with spring bulbs, the plant needs those intact leaves to nourish the rhizome (tuber) for next year's blooms. You haven't killed your irises and new leaves will emerge once the plant roots get established. You may have fewer blooms next spring. Fall is a good time to transplant because even after leaves die back, roots continue to work until the ground freezes.
Should I plant in ground with my other plants or store for next yr. ? .thnx.
The winter hardiness of irises in zone 5 depends on the iris variety you have. Many varieties are hardy and will do well planted in the ground. However, they need to be planted in the ground by the end of July so that they can develop a strong enough root system before the winter sets in. For now, it's probably best to store the rhizome until next year.
http://www.extension.umn.edu/garden/yard-garden/flowers/iris/
I gave someone iris rhizomes 3 years ago. They bloomed the first year but not the following 2. The leaves look VERY healthy, and I wouldn't think they should need dividing already.
Lack of flowering can indicate the plants should be divided.
Excess nitrogen can also inhibit flowering.
https://www.gardeningknowhow.com/ornamental/bulbs/iris/iris-plant-care.htm
can you mow them down in fall and will it help them to come back and bloom better in spring
Let the leaves die back naturally, this feeds that plants for flowering next spring.
https://www.gardeningknowhow.com/ornamental/bulbs/iris/growing-flag-iris-plants.htm
Today I just dug up @ divided my white( large) Iris and smaller purple iris. I'm giving them to my daughter in a week. How do I store them this week????
These articles will help you.
https://www.gardeningknowhow.com/ornamental/bulbs/iris/storing-iris-rhizomes.htm
https://www.gardeningknowhow.com/ornamental/bulbs/iris/dividing-transplanting-iris.htm
I planted seeds from my irises a couple weeks ago and I don't know what to do with them. Can I put them in the ground now in zone 8? I live in the lower part of Alabama. They are about 5 inches high.
They do best planted in spring, but fall is also a good time. You are in an area where you will see enough weather above freezing to let them establish some. You may go ahead and plant now if you wish.
Here is an article with some more information on care: https://www.gardeningknowhow.com/ornamental/bulbs/iris/iris-plant-care.htm
Is it possible to plant Blue Flag Iris by seed in PA?
It definitely is. Here is a link that will give you some good information: