Should iris rhizomes be mulched?
The point of winter mulching is to prevent freeze and thaw cycles which can heave the rhizomes. So if you live in a climate of on and off freezing temperatures, wait until the ground freezes (Dec/Jan depending on location) and then cover with a few inches of mulch. You are trying to prevent a warm day or sunlight from thawing the soil and rhizome. In spring, remove the mulch.
Should ever green Non-Bulbous Irises be cut back and if so when should it be done. Thank You.
Cooler temperatures can cause browning leaves and you can cut these out in spring.
Little maintenance is needed except a light fertilizer application in spring and summer.
You can divide your plant every few years.
When I dig up and cut the irises can I store them somewhere for a few months, or do they have to go right back in the ground?
Yes, you can store them relatively easily. This article will explain in detail how you do this: https://www.gardeningknowhow.com/ornamental/bulbs/iris/storing-iris-rhizomes.htm
I live in Puyallup Washington. I have Iris. They bloomed and then the leaves died. This last weekend I removed all the dead leaves. But I now see the buds coming up and I am wondering if I should have left the dead leaves to protect the buds in the cold winter with the snow coming.
It was probably not the best idea to cut the leaves all of the way down. There is a good chance that they will still survive, as they are pretty resilient, but the proper way to store these can be found Here: https://www.gardeningknowhow.com/ornamental/bulbs/iris/storing-iris-rhizomes.htm
What kind of soil do I use when re-potting Water Iris? Can I buy the soil at The Home Depot or Lowes Garden department? I re-potted Iris last year using "Potting Soil" but every one of them died. I also put Iris clumps that I divided tucked around some boulders and rocks around the pond and they all lived.
It is less about the soil, and more about keeping the pot and soil completely or close to completely wet at all times. This can pose a problem for container plants, so Peroxide will become your best ally in preventing infection to your plants. This article will help: https://www.gardeningknowhow.com/ornamental/bulbs/iris/water-iris-plant-care.htm
I remember reading about a flower that grew wild along the roads in England. It was called Gladwins, but I cannot find any such flower listed anywhere. Do you know of any such flower?
I hope this is what you are looking for: Stinking iris, aka gladdon, gladwin and others. A perennial with glossy, rich green leaves and small, yellow-tinged, purple flowers followed by large pods opening to show bright orange-red seeds, persisting into winter. Height and spread 40cm (16in). (from RHS.org)
https://en.wikipedia.org/wiki/Iris_foetidissima
I read the article on transplanting irises. Quite helpful. However, it says the best time to separate them and transplant is in the summer when they're through blooming. Mine are sort of out of control. Heaving up from ground,etc. I live in California and it's the end of January. OK to transplant now? I'm afraid they won't bloom in their current state.
These links 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
https://www.gardeningknowhow.com/ornamental/bulbs/iris/planting-dutch-english-and-spanish-irises.htm