Louisiana Iris

Iris spp

Characteristics

Culture

Louisiana Iris is easily grown in average to rich, slightly acidic, moist to wet soils in full sun to part shade. Adaptable to different soils, climates and cultural practices. Prefers full sun, but appreciates some afternoon shade particularly in hot summer growing conditions. This is a water-loving iris. The wetter the soil, the more vigorous the growth. Deep watering is best. Grows well in up to 6” of standing water. Tolerates clay soils which retain moisture. Avoid well-drained sandy soils unless copious amounts of organic matter are added. Soils should never dry out during the growing season. Can be grown in pots sunk into the ground in water gardens. Louisiana Iris can also be grown in elevated beds as long as adequate moisture levels are maintained. Best planted in late spring (early May to early June). Fall planting (mid-August to mid-September) also works, particularly in areas with mild winters. In colder climates, apply a year-round mulch of pine needles around each clump.

Noteworthy Characteristics

Louisiana iris is a catchall term used to describe a large group of rhizomatous beardless interspecific hybrid irises that contain varying percentages of the five species which make up the Louisiana Iris Group: Iris fulva, Iris hexagona, Iris brevicaulis, Iris giganticaerulea and Iris nelsonii. These irises will spontaneously hybridize in the wild. Species in the Louisiana iris group are native to the bayous and marshes, damp hillsides, swamps, and riversides of Southern Louisiana to Florida and the Carolinas north along the Mississippi River drainage to southeastern Missouri and southern Ohio. Notwithstanding the southern native territory of Louisiana iris, the hybrid cultivars available in commerce today are typically winter hardy to USDA Zone 5 (in some cases 4) and are currently being grown in most U.S. States.

Problems

Leaf spot, bacterial soft rot, root rot, iris rust and mosaic viruses may appear. Watch for slugs, snails, cutworms, whiteflies, leaf miners, aphids and thrips. Iris borers can cause significant problems in areas where they are found. Deer tend to avoid this plant.

Garden Uses

Water gardens, bog gardens, pond or stream margins, or moist low spots. Ideal for growing in pots sunken into fishponds or water gardens.

---

Courtesy of Missouri Botanical Society Plant Finder