dutch iris

this is my first post so I hope I am doing it right.
I have some dutch irises and they have two heads is this rare or common place

 

Your doing it fine Not sure what Dutch irises are but it is not unusual to have more than one flower on a stem with most varieties of iris.

 

Thanks Fran I was just wondering as I had never seen multipule heads on that variety before.
I had bought the bulbs a couple of years ago, they flowered the first season with the majority having 2 heads on the one stem, the folowing year nothing appeared so I thought I had lost them, I did'nt touch the ground they are in. this year they came back double the amount and the majority with the 2 heads again.