Welcome Tamara
I also grow a lot of roses in addition to a lot of Irises. First, let me say that I really like your choices. They should look lovely with the roses. Will they bloom together in your climate?
Susanne Spicker has written several blogs on combining Iris with other plants. Her pictures are pretty fabulous. It sounds like you've got an "artist's eye", and I think you'll appreciate this.
http://theamericanirissociety....
The problem I have with Narcissus bulbs in my climate is that the foliage starts looking pretty crappy about the same time the Iris start blooming. I planted an awful lot of them at the front of one border and will be removing sections to replant elsewhere.. Other bulbs with less conspicuous foliage when it dies could work well. Many of the Alliums bloom at the same time as Iris and give a beautiful textural contrast.
I plant 2' apart. I brought in a veggie mix soil for my raised beds, and the Iris have grown incredibly fast in those beds over my native soil. It's hard to walk through them now to deadhead after a year and a half.
One of the earlier mistakes I made in planting beds of primarily Iris, was that I didn't pay attention to bloom time. I put together, what I thought would be great color combinations, but found they didn't bloom together. If you're bouncing the color off of other plants, or just a want an extended season for your bed, then it doesn't matter.
