Information from the Jepson Horticultural Database for
Polystichum imbricans subsp. curtum

Given excellent drainage (modification of compacted or other water-holding soils may be necessary), grows in zones 4, 5, and 6.

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 15, 16, and 17 and also in zone 14.

Given excellent drainage (modification of compacted or other water-holding soils may be necessary), moderate summer watering, full or part shade (morning and winter sun may be tolerated, and continuously moist or wet soil, grows in zones 7, 18, 19, 20, 21, 22, 23, and 24.