Iris blooms in March
show spring’s arrival
By Eddie Smith
MSU Extension Service
One of the first signs that spring has truly arrived in my garden comes at the end of March when irises begin to bloom.
Their elegant flowers rise above sword-like foliage, bringing color and renewal to the landscape. Each bloom feels like a celebration of spring returning to the South. Irises have long been favorites in Southern gardens, and several different types thrive particularly well in our warm, often wet conditions.
The Southern blue flag iris, known scientifically as Iris virginica, is one of my favorites.
This beautiful native plant is right at home in areas with moist soil or along the edges of ponds and ditches. The flowers are a soft bluish-purple, with delicate veining and a graceful form that almost looks like a butterfly hovering above the foliage.
As a native, Southern blue flag iris is also a wonderful plant for supporting wildlife. Pollinators are drawn to the blooms, and the plant thrives in naturalized areas where many other garden plants may struggle. This iris can turn a wet or low-lying spot in the yard into a showpiece each spring.
Another highlight in my late-March garden is the various Louisiana irises I have blooming.
These spectacular irises are beloved across the Gulf South where they are native species. They come in an incredible range of colors, including deep purple, rich burgundy, bright yellow, soft pink, copper and even striking bicolors.
Louisiana irises thrive in the same conditions that make many Southern gardeners scratch their heads. Like the Southern blue flag iris, they are often planted near ponds, rain gardens or low areas that stay moist.
When they bloom, the flowers are large, dramatic and almost orchid-like in appearance.
What I enjoy most about Louisiana irises is their color diversity. Many gardeners often collect different varieties, and when they all bloom together, it creates a beautiful patchwork of color perfectly suited to a Southern spring garden.
Another iris that blooms in my landscape is the yellow flag iris, known scientifically as Iris pseudacorus.
The bright, golden-yellow flowers of this selection bloom around the same time as the other irises. This plant is extremely vigorous and thrives in wet conditions.
But be aware that yellow flag iris is known to be invasive in many areas, particularly around natural waterways where it can spread aggressively. Because of that, I grow mine only in contained areas of my landscape where it cannot escape into natural habitats.
With a little management and careful placement, this iris can still be enjoyed as a striking ornamental plant without creating problems for nearby ecosystems.
Whether you prefer the native charm of Southern blue flag, the incredible color range of Louisiana irises, or the bold golden blooms of yellow flag iris grown in controlled spaces, these plants bring beauty, elegance and wild Southern character to the landscape each spring.
In my yard, their arrival is always one of the moments that tells me the gardening season has officially begun.
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[EDITOR’S NOTE: Dr. Eddie Smith is a gardening specialist and Pearl River County coordinator with the Mississippi State University Extension Service. He is also host of the popular Southern Gardening television program. Locate Southern Gardening products online at http://extension.msstate.edu/shows/southern-gardening.]
Released: March 30, 2026
Contact: Dr. Eddie Smith, 601-403-2280
Cutlines and alt text:
BLUE -- The Southern blue flag iris has long been favorites in Southern gardens, thriving in warm, often wet conditions. (Photo by MSU Extension/Eddie Smith)
Alt text -- A single iris flower has blue petals with a yellow accent.
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LOUISIANA -- One of the first signs that spring has truly arrived comes at the end of March when Louisiana irises begin to bloom. (Photo by MSU Extension/Eddie Smith)
Alt text -- Two irises bloom in yellow and orange colors.
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YELLOW -- Although yellow flag iris is known to be invasive in certain situations, it can be enjoyed when it is grown in contained areas of the landscape. (Photo by MSU Extension/Eddie Smith)
Alt text -- Irises growing in a row have yellow flowers.
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