Your cart is currently empty!
Get Event Reminders…
…twice a month by subscribing to our newsletter
Subscribe using the form in the page footer below.
Your cart is currently empty!
…twice a month by subscribing to our newsletter
Subscribe using the form in the page footer below.
Photo:
NatureFriend vis Pixabay
Iris versicolor, commonly called northern blue flag, is a clump-forming iris that is native to marshes, swamps, wet meadows, ditches, and shorelines from Manitoba to Nova Scotia. It became the floral emblem of Quebec only in 1999, after a tumultuous series of events. It has deep blue to purple flowers, the foliage is sword-like, and the flowers are complex and very showy. Iris flowers are known to symbolize power, with the three petals representing wisdom, faith, and courage. The petals smell like violets and have been used to make perfumes and potpourri.
The iris has a worldwide distribution, occurring throughout the Northern Hemisphere in temperate regions. It is native to Canada and is found in Manitoba, Ontario, New Brunswick, Quebec, Massachusetts and Nova Scotia. In the United States it is found in the south-eastern states from Maine to Florida. In Europe it occurs from Ireland to Scandinavia and Russia.
Botanical Name: Iris versicolor
Also Called: Wild Iris, harlequin blueflag, larger blue flag, northern blue flag
En français: Iris versicolore
Sun / Shade:
Watering:
Water: Keep wet
Height:
Pollinators:
The blooms contain nectar and pollen that attract hummingbirds, bumblebees, butterflies, moths and more. It also serves as shelter for animals that live along shorelines.
Blue flag iris’ natural habitat is ponds or water gardens with sunny places. They love water, so plant in wet areas. They can also be submerged under water for a while and still survive. The Blue Flag Iris is a charming addition to any garden’s wet areas. It is a perennial with violet-blue blooms that bloom in late spring and early summer. The violet sepals are down-curved and veined with yellow and white, and the blooms are 2.5 to 4 inches broad.
Companion plant suggestions include Asclepias incarnata and Carex muskingumensis.
Blue flag iris prefer moist to wet soil conditions. Place it in a wet spot, a well-mulched garden, or in the shallows of a pond to keep its roots moist. Water periodically and mulch upon planting if they are not planted in a swampy or damp location. They can withstand drought.
Blooms usually last 2-3 days, so it is recommended you dead head the wilted blooms to ensure new growth.
You can remove dead flower stalks with scissors as well as any dead flower heads, just to keep the plant looking nice. Make sure to only prune when the foliage is becoming yellow. The leaves help store energy for the plant’s rhizomes and so they should not be cut early.
After fall frost, plant leaves may be trimmed back to about 1” above the crown.
In nature, Blue flag iris forms colonies via self-seeding and creeping rhizomes. They should be propagated through division after 2-3 years of growth to keep them under control. Propagate via division after they have finished blooming. When propagating, use gloves; be cautious since the rhizomes are very toxic and can cause skin irritation.
When propagating by seeds, compress them into the soil, but do not bury them.
Their roots are dangerously poisonous to both humans and livestock. Rhizomes (thickened roots) and rootstocks, fresh or dry. Minor skin irritation when touched, low toxicity if ingested. Symptoms include nausea, vomiting, abdominal pain, diarrhea, elevated temperature following ingestion; skin irritation upon contact with seeds, rootstock, or cell sap
Irises have been used medicinally in the past, despite its highly poisonous rootstocks. Some tribes used the fibres of the leaves to spin strong, fine twine.
Prone to damage from rabbit, vole and other small mammals. Slugs and snails frequent the Iris as well. Leaf-chewing caterpillars, sap-sucking aphids, whiteflies and spider mites are common iris pests. Holes in the leaves or chewed leaves are signs of caterpillars. You can get rid of aphids by mixing a little bit of dishsoap and water and spraying the leaves every 2-3 days for about 2 weeks.
Logging in to comment gives you more features, but it is not required.
This is a complete guide on growing garlic, including how to plant garlic, when to plant, weed control, watering, curing and more. Read on.
Discover the distinct features and habitats of Lysimachia quadrifolia, a species of herbaceous plant in the Primulaceae family. Learn more about its Liner robust leaves, five-parted, yellow flower & how it spreads in wet meadows, grasslands, fields, swamps & marshes.
Discover our resident and migratory birds in the Vallarta Botanical Garden! This February, the Gray-black Warbler (Setophaga nigrescens) brings its buzzing song, grayscale plumage and yellow dot to the garden. Join us for our Bird and Nature Festival to celebrate the diversity of these feathered travelers and explore our coniferous and oak forests while they hunt insects and their larvae! Listen to the Warbler's song: http://bit.ly/3kPMpP6
Learn how to attract beautiful and remarkable ruby-throated hummingbirds to your garden using native plants and proper nectar solutions.
Downy Serviceberry provides food for over 40 species of birds. The berries can be used to make jams or pies. Read the Quick Growing Guide.
Gardening is a multisensory experience. When you walk into a garden, discover and experience scented pleasures. All senses can be stimulated in the garden.
Discover how to optimize your small garden space with layers of plants and create stunning color combinations for year-round blooming.
Admire the mysterious prayer plant, Maranta leuconeura, during the day and night as its leaves fold like praying hands. This popular plant also has chocolate brown markings on its leaves, making it truly unique!
I have bulbs growing and that is amazing. I am keeping watch. Each day new and interesting things are emerging.
Swamp Rose mallow has exotic, oversized flowers that are very striking. New flowers can open every day from July to September.
Create your own stunning succulent arrangements with this DIY video from Garden Answer! Enjoy indoors & out w/ plenty of textures, colors, & heights to choose from. Easy to take care of – just follow the tips & you’ll have a beautiful flower show year round.
Discover the vibrant bloom of blue vervain & explore its traditional uses, habitats, and cultivation methods! Learn about this hardy perennial plant native to North America & its many alternate names, such as Simpler's Joy & Swamp Verben.
GardeningCalendar.ca gets some funding from advertisers. If you click on links and advertisements at no cost to you, the site may receive a small commission that helps fund its operation.
© 2025 J&S Calendars Ltd.