Named by James Audubon himself, Louisiana iris describes a series (Hexagonae) of beardless iris that contains five species. These irises are adaptable and grow in a wide variety of conditions, from the water to the garden. The most important element when growing the Louisiana iris is, in fact, water. While it will thrive planted directly in a pond or other water source, deep watering twice a week is recommended for those planted in pots or in the garden. Plant the Louisiana iris from mid-August to mid-September.
Place the Louisiana iris bulb in a glass of water until you are ready to plant. Choose a location in full sun in which to plant the Louisiana iris.
Add a 3-inch layer of rotted manure and a 2-inch layer of peat moss to the planting bed and til the materials to a depth of 6 inches. Add 8-8-8 fertilizer (10 lbs. per 100 square feet of flower bed) and mix that in to the same depth.
Plant the iris bulbs so that the top of their rhizomes are just above the soil level, 12 inches apart, in a triangular pattern.
Water the iris bed to a depth of 6 inches and keep the soil moist at all times.