Information from the Jepson Horticultural Database for Iris hartwegii subsp. columbiana
Given excellent drainage (modification of compacted or other water-holding soils may be necessary) and moderate summer watering, grows especially well in zone 17.
Given excellent drainage (modification of compacted or other water-holding soils may be necessary), moderate summer watering, and full or part shade (morning and winter sun may be tolerated), grows especially well in zones 7, 15, and 16
and also in zones 1, 2, 3, 9, 14, and 18.
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