Hard to assess your bearded iris without seeing what's going on. There will always be fans in clumps that have no bloom stalk. If you have a vigorous yellow it can overtake weaker growers. Have you only had yellow bloom in past years? If they are all the same it's an 'easy' job to redo. If you have colors mixed together you could use a conservative approach. Removing duplicates only.

I mark iris for removal when they are in bloom. As soon as the last bloom is wilting I dig that/those rhizomes, leaving some for future bloom. I don't have the space to keep all the increases.

A reliable purple rebloomer is Rosalie Figge. She is not a red-purple as some photos show.

Check out Sutton's list for more ideas.

Here is a link that might be useful: http://www.suttoniris.com/html/rebloom.htm

If you want a short purple with excellent rebloom you can get Grandma's Purple Flag. It bloomed all year here. It will give your yellow iris some competition.

About the iris that have not bloomed: are they mixed in with the ones that are blooming? If so, your iris need to be divided. They stop blooming when they get too crowded.

I have an iris named CLARENCE that is a prolific rebloomer in Central Indiana. It has white standards with a blue-purple falls. CLARENCE is one of my most reliable rebloomers.

I really don't know what this one is. I got it at Walmart in a package that said blue bearded iris. It did not mention that it reblooms. I planted the two bulbs that were in the package, and, like yours, one has never bloomed. The other won't stop blooming! It also won't stand still in the wind to get it's picture taken, so it's a little blurry! Taken Yesterday

Looking for a list of reliable reblooming irises for Pennsylvania zone 6

Hi dirtywench,
It is difficult to get tall bearded irises to rebloom in your zone, because by the time they put up second stalks a freeze hits and they go kaput. There are a number of median irises that rebloom, though.

Many folks have luck with TB Immortality. You can also check the list at the Reblooming Iris Society's website, I think they list zones.

Renee

Here is a link that might be useful: List of Reblooming Irises