Four blooms is great if you had 4 plants. It looks they are the bearded type with rhizomes? I wasn't sure from what you said if the Iris have been in the same place for the past 3 years, or you've moved them, trying to find the happy spot?
Some are fragrant, worth a always worth a sniff to check, BTW, IME. My Mom and I have been passing some purple ones back & forth for about 25 years, and brought some down from OH.
The bearded kind with the rhizome are susceptible to rot (anywhere that can stay moist for days at a time, or poorly drained/heavy clay soil in general) and borers (in some places) if the rhizomes are buried. Over time, they pull themselves underground, crowd themselves, and can get buried from the top by bits of leaves and wind-blown or rain-splashed grit. So every few years they get dug up and re-set.
Once the foliage is about finished, pull/dig them all up, knock the excess soil off, let dry in the shade for a day or two, if possible. Remove any that have holes, are mushy. Then sit them on the surface, burying any attached roots but not the rhizomes any more than necessary to get them to stand up. Trimming any remaining foliage to a few inches can help keep them from blowing over. Doing this in OH and AL results in a great show of flowers the following spring, unlike the "skipped a year" thing some other kinds of perennials can be expected to do.
There are other Iris with a more 'normal' looking bulb, this info doesn't apply to those, I've never had any of those.
