Yellow Flag Iris (Iris pseudacorus)

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Product Overview

Yellow Flag Iris (Iris pseudacorus)  See Iris pseudata

Canary yellow spring flowers above 3- 4'+ vertical green foliage. Yellow Flag iris is very hardy and a strong grower. Plant in a large container, as the rhizome grows fairly fast and large.

Hardiness Zone: 4-9
Planting Container: We recommend a 2 gallon solid planting container or a medium planting bag.
Light Requirements: full sun to part shade
Height: 3' to 4' - Spread: 24" to 30"
Water Depth: Moist Soil or water up to 6" above the crown (Maximum water depth is for mature bog plants)

Note: We no longer sell this Iris species, as it is now listed as a noxious weed in a number of states (CT, ID, IL, IN, MA, MD, MT, NY, OR, VT, WA, WI, etc), and that number is increasing all the time. This is due in large part to its promiscuous seeding habit, with seeds floating downstream or across the lake. Native plants can't be considered invasive by definition, but while many people think yellow flag iris is native, it was actually imported from Europe (a long time ago!).

Fortunately, the Iris peudata (pseudacorus x ensata) cultivars are far superior to the Iris pseudacorus species, better flowering and with many more choices in bloom color and shape, as well as the height of mature plants--and they are great in ponds! Please check out our selection of Iris pseudata, which includes a range of yellow colors in addition to purples, whites, pinks, etc. 

Iris 'Roy Davidson' is another excellent substitution for yellow flag iris; it is yellow and a better bloomer than yellow flag, and is a sterile cross between yellow flag and an unknown iris.



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  • 5
    Great Plants!

    Posted by Connie Padilla on May 19th 2020

    The plants are amazing and great quality!

  • 5
    Yellow Flag Iris

    Posted by PAULA BARKER on May 22nd 2019


  • 4
    Lots of flags for the money

    Posted by TammyJ on May 17th 2016

    I ordered three of these to make an island in my pond. They arrived quickly, just coming out of winter hibernation in a greenhouse and a bit pale. Many of the leaves were broken due to shipping, but the rhizomes all had multiple new leaves already coming out. These arrive in almost no soil and need immediate planting. Ive had mine four days and they already are turning dark green and seem to be thriving. Ive had these before and they are stunning in the garden because of their size. Much taller than most iris' and a beautiful yellow. Stunning in mass and will draw you to them.