southern blue flag

Southern blue flag (Iris virginica 'Purple Fan') should be watered approximately once per week. The amount of water should be slightly more than enough to keep the soil moist but not saturated. During hot, dry weather the plant may require additional water. Soil should be monitored, and, if dry, water should be added until moist for optimal growth. In extreme conditions, it may even require daily watering, but this is usually not necessary. Once well established (about a month after planting) it can usually tolerate occasional dry spells.

Southern Blue Flag plants should be grown in direct sunlight for approximately 4-6 hours per day. They grow best in sunny areas, but will tolerate part shade. They should be planted in well-drained soil and can even grow in shallow or standing water. This species of Iris grows best in USDA Hardiness Zones 4-10.

Southern blue flag requires pruning twice yearly; once in the early spring and once in the late summer. In the early spring, prune any dead foliage, as well as to shape the plant as desired. In the late summer, cut back the foliage to the ground. This will encourage a stronger root system and better blooming the following spring. Prune to a height of approximately 10-14 inches. Deadheading (removal of spent blooms) throughout the growing season may also be beneficial.