Not quite sure what you mean by bulbs. Bearded irises have a rhizome at the base of the plant. from this rhizome, new ones grow, which will produce new leaf fans, and eventually new flower stalks. These can be divided and planted as seperate plants when the clum is big enough.
Dutch iris grow from a bulb which is smaller than a daffodil bulb, fairly rounded and has a brown papery outer coat.
Sometimes bearded irises produce a seedpod at the top of the bloom stalk. This is green, oval in shape and can vary in size from tiny, up to as big as 3" long. This may be empty or contain seeds.
If you get one of these, and you haven't deliberately hand pollenated your flowers, then you have what is commonly called a bee pod, because, presumable the bees did the work of pollenating the flower.
This will contain seeds from an unknown cross. These can be planted and grown to produce new plants, all of which will be genetically different from each other and both the parent plants.
Hope that helps.
Cheers, Jan in Australia

Seed pod was the word that I couldn't come up with. Not a bulb but looks like a giant bulb. I have plenty of beds to plant it in. When do you open it to check for seeds? Do you plant them individually or several to a hole? I really do appreciate your information. I am learning so much from these forums. I have been growing flowers and veggies for many years, but never bothered to do anything but buy package seeds. I'm retired and have time to experiment and learn.

You need to leave the seedpod on the stalk until it turns brown and starts to crack open, them you can pick it and take out all the seeds.
Store the seeds in a cup or envelope, then plant all the seeds in pots about 3/4 inch deep in the fall, keep pots damp at all times, by spring you should have some germination.
When the seedlings are about 6 inches tall, they can be transplanted into the garden.
You should see bloom the spring after, or 2 years (sometimes 3) from now.