I planted Siberia iris about ten years ago. I seem to remember them in bloom that 1st year, but they have never bloomed since. As usual, this year the green leaves (stalks?)have emerged but that’should all. What can I do?
Diane, after giving Siberian iris a year or two to settle in, if there are no flowers it's usually because the plants aren't getting enough sunlight. They need at least 6 hours of sun and are happiest with full sun.
If that's not the issue, are they planted in alkaline soil? They prefer neutral to slightly acid pH.