I have my iris' in a pot and have had them 2 or more years with no blooms why?

Irises like it on the dry side so make sure you’re not over watering them. Also, make sure that your have rhizomes planted right at soil level. F.Y.I.: Irises don’t like mulch covering them because this keeps them overly moist and can cause the rhizomes to rot away. (I’m sure you’re not mulching your pots.)