What type of iris? Did your friend give you planting instructions?

Assuming they are bearded irises, there could be numerous reasons, but my first 'guess' would be that they are planted too deep, and the second, not enough sun.

If they are bearded irises, you might read through the list at the link below.

Sue

Here is a link that might be useful: I have no bloom on my bearded irises. Why are they not blooming? (from the Forum FAQ)

Thank you for the responses. I believe the problems might be I planted too deep and not enough sun.