Do you know what kind of iris they are?
Are they bearded or Ensata?
If you can send us a photo of the plants and there location we can give you better advice.
If they are bearded iris...
Here are the basics. (It looks like you are in 9a. A very warm place.)
1- Make sure they are getting direct sunlight. Generally the rhizome likes to be above the surface but if they are too hot then just barely beneath the surface for you. They bloom better if direct sunlight kisses the rhizome.
2- Each rhizome needs a little space so they don't start to grow on top of each other.
3- The rhizomes like to be on the dry side of life but keep the roots covered and deeply watered periodically. Don't over water.
4- put some triple phosphate on them in early spring. Don't fertilize them heavily with nitrogen.
If they are Ensata they want to be very damp and receive rich sunlight with the rhizomes just underneath the soil level,
