I have what I think is Dutch Iris which was given to me by a friend. I have had them for about four years or more and only about two to three bloom. What can I do to make them bloom. Thanks
Dutch Iris can be fickle. They are picky about soil, moisture, temperature and sunlight.
They require a 6 to 9 week cooling period to bloom well.
They also may need to be divided and given a bit more room.
Depending on the variety that you are growing, they may not be as well suited to your growing zone as some others.
Here is a link to refresh you on the care requirements.