sybil let them be you should not have to any thing to them for abought 3 years. they will multiply and get lots more blooms each year. when they really get growing
into big clumps then you can divide them and replant them so you will have more.just make sure you don't plant
them to deep just deep enough to cover the rhizome root system very lightly with soil they love full sun.heres a link that i think will help you. http://www.thegardenhelper.com/iris.html
in the mean time just let them grow do not cut anything off them it uses the old growth as food for next years blooms.heres a couple of photos of some of my iris from this year they are 3 year old plants
.which i will divide this year.
hope this helps.your friend in gardening.mike57