About

Iris virginica, the southern blue flag, is a rhizomatous iris producing upright, blade-like foliage and well-formed, lavender-blue blooms with characteristic spreading falls and upright standards in late spring and early summer. A rewarding and ornamental moisture-loving iris for a waterside or bog garden position.

About the genus

Iris are rhizomatous or bulbous perennials with narrow, often sword-shaped leaves and erect stems bearing flowers with three large, spreading or pendent fall petals alternating with three erect, often smaller, standard petals in late winter, spring or early summer. One of the most varied and spectacular of all plant genera, encompassing everything from tiny bulbous species to tall bearded border irises.

Plant details

Suggested usesBorders, containers, cottage gardens. Excellent as cut flowers.

Care notes

CultivationGrow in well-drained, fertile soil in full sun. Plant rhizomes shallowly with the top exposed to the sun. Water during dry spells but avoid waterlogging.
PruningRemove spent flower stems after blooming. Cut back foliage to a fan shape in late summer. Clear dead leaves in autumn.
PropagationDivide congested clumps every 3-4 years after flowering. Replant healthy rhizome sections with a fan of leaves.
Pest resistanceSlugs and snails may damage young growth. Otherwise generally pest-free.
Disease resistanceLeaf spot and rhizome rot can occur in wet conditions. Ensure good drainage and air circulation.
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