Information from the Jepson Horticultural Database for Iris macrosiphon
Given excellent drainage (modification of compacted or other water-holding soils may be necessary) and absence of frequent summer water (distance from water-loving plants), grows especially well in zones 6 and 17.
Given excellent drainage (modification of compacted or other water-holding soils may be necessary), absence of frequent summer water (distance from water-loving plants), and full or part shade (morning and winter sun may be tolerated), grows especially well in zones 14, 15, and 16
and also in zones 7, 8, and 9.
Given excellent drainage (modification of compacted or other water-holding soils may be necessary), moderate summer watering, absence of frequent summer water (distance from water-loving plants), and full or part shade (morning and winter sun may be tolerated, grows in zone 18, .
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