southern blue flag

Southern Blue Flag should be watered regularly from spring to fall for the best results. During the first few months of growth, water the plant at least once a week. As the plant matures, adjust the watering schedule accordingly and water the plant whenever the top few inches of soil feels dry to the touch. When hot and dry conditions prevail, water more frequently; about twice a week should suffice. During cooler and wet periods, water less often and let the soil dry slightly between waterings.

Southern Blue Flag plants flourish in direct or partial sun with 3 to 4 hours of direct sun each day during the growing season. They will tolerate partial shade during periods of extreme heat but should be exposed to some sunlight at some point during the day. For best results southern exposure is preferred. Additional sun may be beneficial but reduce the likelihood of moisture and disease, and can cause the blooms to fade if not managed properly.

Southern Blue Flag (Iris virginica var. shrevei) should be pruned twice per year: once in late fall and again in late spring. In the fall, remove any dead, dying, or weak leaves and stalks, as well as flowers if any remain. Cut above the base of the plant's crown, since this will promote more vigorous growth from the base of the plant. In the springtime, use sharp pruners or loppers and take the same steps to cut off any dead leaves, stalks, and flowers. Pruning back plants during the late winter and early spring season will allow for new, healthy growth. Pruning will also encourage flowering from mid-June to mid-July. After the flowering is complete, you can once again prune off any dead, dying, or wilted leaves, stalks, and flowers.