Audubon® Southern Blue Flag Tree
Audubon® Southern Blue Flag Additional Product Shot 2297
Audubon® Southern Blue Flag Additional Product Shot 2447
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Audubon® Southern Blue Flag Tree
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Audubon® Southern Blue Flag Additional Product Shot 2297
Audubon® Southern Blue Flag Additional Product Shot 2447

Growth Facts

Audubon® Southern Blue Flag

Iris virginica var. shrevei

This plant is not available at this time through Bower & Branch. Bower & Branch provides this information for reference only. Please click here to be placed on a waiting list. See below for other selections.

Wet sites are transformed from mucky to marvelous with Southern Blue Flag! This perky native Iris flourishes in soggy situations and will delight you in late spring and early summer with a bevy of fragrant, violet-blue flowers. The blooms may attract long-horned bees, which sound menacing, but they’re actually quite cute. These gentle native bees have extra-long, black antennae and fuzzy yellow faces. Bumblebees, butterflies, and hummingbirds may frequent the flowers, too. Southern Blue Flag is a fast grower, and soon you’ll have enough blossoms for wildlife and for the table. It makes a lovely cut flower.

May Benefit & Attract: Hummingbirds

Take Birds Under Your Wing

New! Introducing our bird-friendly collection of Audubon® Native Plants & Trees

  • Better for Birds, 100% Neonic-Free
  • Not Available in non-native regions, states or counties (see Native Regions map)

Bower & Branch is proud to grow Audubon® Native Plants for Birds in partnership with the National Audubon Society to help birds and other wildlife thrive.

  • The National Audubon Society protects birds and the places they need, today and tomorrow
  • This bird-friendly native plant provides food and shelter for local and migrating birds and other wildlife
  • Your purchase and planting of this native flora directly supports Audubon’s conservation mission and impact
  • Learn how you can help birds in your home and community through Audubon’s Plants for Birds program
  • Audubon Native Plants & Trees are free of neonicotinoids and exclusively grown by Bower & Branch

Audubon® is a licensed and registered trademark of the National Audubon Society. All rights reserved.

Growth Facts

Recommended by Our Growers

The Story

Those who live in the North need not dismiss Southern Blue Flag. This poorly named Spirit is native to many northern states as well as southern ones, and it is hardy to 30 below zero! It is most abundant in the states surrounding Lake Michigan and along the Mississippi River Valley. Southern Blue Flag is very similar to the Northern Blue Flag in appearance and growing preferences. Southern Blue Flag’s flower is perhaps a bit more delicate, and its petals have a brighter spot of yellow on them. Both are fabulous on the banks of streams, ponds, and bogs.

The Details

Over the years, many of our native wetlands have been drained or filled in. Long considered useless, wetlands are actually precious to wildlife, water quality, and the health of the whole planet! We should preserve those spaces and the plants that flourish there. Southern Blue Flag is one such species that we can’t afford to lose. Besides servicing wildlife, it’s a living water filter that cleans mucky water naturally.

How to Grow

Northern gardeners as well as Southern ones will have success with Southern Blue Flag Iris. This plant is very easy to grow, as long as it is given full sun, rich soil, and consistent moisture. Southern Blue Flag will grow in up to four inches of standing water. Because it is poisonous to eat, deer don’t graze it. The roots are toxic, too, and even touching them may irritate some people’s skin. Be sure to wear gloves if you decide to divide your plants (this is an easy way to make more). You can cut back the old foliage in early spring, if desired.

Size Guide

Size Guide Scale


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Audubon® Southern Blue Flag Tree
Audubon® Southern Blue Flag Additional Product Shot 2297
Audubon® Southern Blue Flag Additional Product Shot 2447