Ann Chowning Louisiana iris (Iris ‘Ann Chowning’) is a showstopper that brings bold, saturated color to the late spring garden. A cultivar within the Louisiana iris group, it’s a hybrid derived from a complex of iris species native to the Gulf Coast region of the United States, primarily Louisiana and surrounding states. Hardy in USDA zones 4 through 9, it’s a remarkably adaptable plant that performs across a wide range of climates. It thrives in full sun to partial shade and prefers moist to wet, acidic soil that’s rich in organic matter. It’s an outstanding choice for rain gardens, pond edges, and boggy spots where many other perennials struggle to survive.

Ann Chowning is one of the most beloved Louisiana iris cultivars, and it’s easy to see why. It produces large, elegantly formed flowers in a deep, velvety red with a prominent yellow signal at the center of each fall, the term for the lower petals. Bloom time runs from mid to late spring, typically April through May depending on your region. The flowers are held on strong stems above fans of upright, sword-like foliage that remains attractive through much of the growing season. The overall effect is lush and tropical-looking, with a richness of color that photographs beautifully and draws plenty of admiring comments in the garden.

Louisiana irises in general are among the most adaptable of all iris groups, and Ann Chowning is no exception. Unlike bearded irises, which demand excellent drainage, Ann Chowning actually tolerates standing water for periods of time, making it genuinely useful in wet areas of the landscape. It can be grown in garden beds with consistently moist soil, at the margins of water features, or even in containers submerged a few inches in a pond. In drier climates or sandy soils, it’ll need supplemental irrigation to perform its best. It spreads gradually by rhizome to form attractive clumps and works well as a border plant, a mass planting, or a specimen alongside water. It’s not considered deer resistant, so some protection may be needed in heavily browsed areas.

Plant care

Ann Chowning Louisiana iris is vigorous and rewarding to grow, but it does have some specific preferences that are worth understanding before you plant.

Watering

Consistent moisture is the single most important factor in growing Louisiana irises well. Ann Chowning wants soil that stays moist, and it genuinely thrives in wet conditions that would rot most other perennials. In garden beds, water deeply and regularly, especially during the growing season and in the weeks leading up to bloom. In hot, dry summers, mulch heavily and water frequently. If you’re growing it at a pond margin or in a water garden, it can tolerate water up to about 6 inches deep over the rhizome.

Soil and fertilizing

Plant in rich, acidic soil with a pH between 6.0 and 6.5. Louisiana irises are heavy feeders and respond well to fertilization. Apply a slow-release, balanced fertilizer in early spring as growth begins, and again after blooming is finished. Some growers also apply a light feeding in fall to support root development before winter. Avoid lime or any soil amendment that raises pH, as alkaline soil will cause the foliage to yellow and overall performance to decline.

Planting depth

Plant rhizomes just below the soil surface, no more than 1 to 2 inches deep. Unlike bearded irises, which prefer their rhizomes to sit near the surface in full sun, Louisiana irises benefit from a little more coverage to keep the roots moist. In water garden settings, plant in aquatic baskets filled with heavy clay-based soil.

Mulching

Mulch generously, particularly in colder climates where freezing temperatures could damage the rhizomes. A 3 to 4 inch layer of organic mulch like pine straw or shredded leaves helps retain moisture, moderates soil temperature, and acidifies the soil as it breaks down. Pine straw is a traditional and particularly effective choice for Louisiana irises.

Dividing

Clumps benefit from division every three to four years to prevent overcrowding and maintain vigorous bloom. The best time to divide is in late summer or early fall, after the foliage has begun to die back. Dig the clumps, separate the rhizomes, and replant promptly, keeping them moist until they’re reestablished. Divisions done in fall will be ready to bloom the following spring.

Siting and landscape use

Ann Chowning is at its best when planted in masses along water features, where its bold red flowers reflect beautifully off the surface and its upright foliage provides strong vertical interest. It’s also excellent in rain gardens, drainage swales, and low spots in the yard that tend to stay wet. In a mixed perennial border with reliable moisture, it combines beautifully with plants like Louisiana phlox, swamp milkweed, and cardinal flower. Plant it in groups of at least three to five for the most visual impact. The foliage, while not showy, remains tidy through the growing season and provides a nice structural element even when the plant isn’t in bloom.

Winter care

In zones 4 and 5, apply extra mulch in late fall to protect the rhizomes from hard freezes. In zones 6 through 9, Ann Chowning is largely evergreen or semi-evergreen and needs minimal winter protection. Cut back any dead or damaged foliage in late winter before new growth emerges. In very warm zones, the foliage may stay green nearly year-round.

Pest and disease

Louisiana irises are generally healthy plants. Iris borers, the most common pest of bearded irises, are less of a problem for Louisiana types, though they can occasionally appear. Inspect foliage in spring for signs of borer damage and remove affected leaves. Aphids may cluster on new growth in spring and can be knocked off with a strong stream of water or treated with insecticidal soap. In poorly drained or alkaline soils, root rot and leaf spot can develop, which is why getting the soil conditions right from the start is so important.

---

Frequently asked questions

What makes Ann Chowning different from other iris varieties? Ann Chowning belongs to the Louisiana iris group, which is distinct from bearded, Siberian, and Japanese irises. Louisiana irises are native to the Gulf Coast and are uniquely adapted to wet conditions. Ann Chowning stands out within this group for its exceptionally rich, deep red flower color and its vigorous growth habit.

Can I grow Ann Chowning in a regular garden bed? Yes, as long as you can provide consistent moisture. It doesn’t have to be planted in water or a bog to thrive, but it won’t do well in dry or drought-prone conditions. Amending the soil with compost and mulching heavily will go a long way in a standard bed.

Can I grow it in a container? Yes. Plant it in a large container filled with rich, moisture-retentive soil and keep it consistently wet. It can also be grown in a submerged aquatic container in a water garden, with the crown just at or slightly below the waterline.

When should I plant Ann Chowning? Late summer to early fall is the ideal planting time, which gives the rhizomes time to establish before the growing season. Spring planting is also possible, though plants may not bloom their first year.

Why isn’t my Louisiana iris blooming? The most common reasons are insufficient sunlight, soil that’s too dry, soil pH that’s too high, or overcrowded clumps that need dividing. Louisiana irises also need adequate fertilization to produce strong blooms. Make sure the plant is getting at least six hours of sun and that the soil is consistently moist and acidic.

Is Ann Chowning deer resistant? It’s not considered particularly deer resistant. If deer browsing is a concern in your area, consider protective measures, especially when new growth is emerging in spring.

How tall does Ann Chowning get? It typically grows 24 to 36 inches tall in bloom, with the foliage forming a fan that reaches about 24 inches. Exact height can vary depending on growing conditions.

Is it invasive? No. Ann Chowning spreads slowly and steadily by rhizome but isn’t considered invasive. It forms clumps that are easy to manage and divide.