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Southern Blue Flag: How to Plant, Grow, and Care for Iris Virginica

Thinking of planting an Iris virginica in your garden? This carefree aquatic plant, usually found in the wild across the Southern and Eastern United States, is the perfect addition to any water-heavy spots in your garden. Gardening expert Madison Moulton examines the best ways to plant, grow, and care for the Southern Blue Flag. Nestled the balmy heat of the Southeastern United States, from Virginia to Louisiana and into Texas, sits Iris Virginica – a delicate herbaceous perennial. The small, intricate blue blooms top long stems, surrounded by spiked green leaves that contrast in texture and structure.
Looks are not the only thing this showy plant has going for it. It is also incredibly low maintenance, growing well anywhere it is provided wet soil. This makes this Iris which has a striking blue flower, an ideal addition next to ponds or streams, or as a part of a water feature.
Although it resides largely on the South coast, this plant will thrive in a range of climate regions. No matter where you reside, you won’t regret adding this plant to your water garden.
What Is Iris Virginica?
The Virginia Iris is a member of the Iris genus, containing hundreds of species and cultivars with similar detailed, interesting flower types. The genus name comes from the Greek for ‘rainbow’, seemingly referring to the colorful flowers found across these fascinating species. Iris Virginica is Native to the Eastern and Southern coastal regions of the United States, it features bluish-purple blooms surrounding a yellow and white center. The yellow patch is believed to guide pollinators to the nectar inside the center of the flower. Each petal is decorated with deep violet veins that stand out against the light base. The delicate flowers are surrounded by clumps of sharp green leaves that add volume to the plant.
This plant is commonly compared to its Northern counterpart, Iris versicolor. Both Iris species are incredibly similar, growing in the same wetland conditions and sporting similar flowers. However, Northern Blue Flag is understandably more cold-hardy, growing well in USDA zones 3-9.
Southern Blue Flag (and Northern Blue Flag, too) is mostly found in the wild and not typically grown in home gardens. They are skipped over in favor of their more popular ornamental relatives. However, this shouldn’t stop you from growing it in your own backyard. These plants provide the classic Iris look we all love in wetland conditions. This makes them ideal for tricky spots like ponds, or planted in rain gardens, where they will grow without fuss. They are also native to the US, a great alternative to some of the invasive Iris species that disrupt the local environments.
Propagation
There are a few ways to correctly propagate the iris virginica. In the wild, Virginia Iris spreads by dropping seeds or slowly extending the rhizomes. When left to spread on their own, the clumps can become congested, preventing further prolific growth and flowering. When kept in your garden, it is best to divide and replant the rhizomes every few years to promote flowering. Alternatively, you can harvest the seeds and replant them immediately, straight into the garden.
Dividing Southern Blue Flags
Division is best done in late summer or early autumn. When the leaves begin to yellow, you’ll know the plants are ready to be propagated. Divide after the plant has finished flowering to enjoy the best of its blooms for that season and limit the risk of bacterial soft rot. To divide, gently lift the plant out of the soil with a fork, ensuring you do not damage the rhizomes. Depending on the age of your plant, you may be able to pull the rhizomes apart, but if not, they can be cut with a clean, sharp knife. Use this time to remove any unhealthy rhizomes or dying leaves. New, healthy rhizomes will be plump with plenty of leaves, while older ones will have a woody texture. Cut the leaves to around a third of their height. This allows the plant to focus its energy on rhizome regrowth, limiting any potential transplant stress. Replant the viable rhizomes back into the garden, ensuring they have plenty of sunshine and water to reestablish themselves.
Propagating From Seeds
When propagating from seed, plant immediately after harvesting when the seeds are still ripe. You’ll know the seeds are ready when the pod turns brown and dries out. Iris virginica seeds do not respond well to being stored and, if allowed to dry out, will no longer be viable. Plant the seeds straight into the garden in fall and they should emerge again come springtime.
Planting
This particular plant should ideally be planted in early spring.
Rhizomes are best planted in fall, but potted plants can be transplanted into the garden in early spring to get the most of their late spring and summer flowers. Plant around 2’ apart to give the plants enough space to spread. Ensure the area you are planting in has plenty of sunlight and receives a good amount of water throughout the day. Ideal spots include bog gardens or rain gardens, or along streams and rivers. This perennial can be planted as a border plant in garden beds, but will need constant watering to thrive. When planting in beds, ensure you pair it with other water-loving plants to match their needs. As they need consistently moist soil, most other common bedding plants will succumb to root rot under the same conditions.
Care
One of the great benefits of growing this plant species is its remarkably carefree nature. When given the right environment, this plant will grow and flower reliably for many years without too much intervention from you.
Light
When it comes to light, this plant needs plenty of sun to produce its showy flowers. In most regions, it is best planted in a full sun position. However, in hotter areas, it may benefit from some shade in the afternoons. The more shade this plant receives, the less likely it will be to flower.