Invasive Plant

Yellow Flag Iris

Iris pseudacorus
Warning icon

Warning

Can be toxic to humans and animals and cause human skin irritations.

About This Species

Yellow flag iris invades ditches, wetlands, streams, lake shorelines, and shallow ponds. This plant reproduces through seed dispersal, horizontal roots, and when pieces of the roots break off, which can form new plants. The seeds float on the water in spring and fall, causing them to spread quickly. Several hundreds of plants may be connected underwater due to the extensive root system, which creates a thick mat that damages wildlife habitat, reduces water flow, and crowds out native vegetation.

How to Identify

Flowers are bright yellow, often with brown spots or purple veins, with 3 upward pointing petals and three downward pointing, tongue shaped “petals”, called sepals. Flowers appear on a smooth stem about 100-150 cm tall. Leaves are flat and sword-shaped, up to 90 cm long and 3 cm wide.

Report an Invasive Species

Use the app

Help us track and defeat invasive species.

Report through this website

Use our form to tell us what you’re seeing and where.

CONTACT INFORMATION

SPECIES INFORMATION

Click or drag files to this area to upload. You can upload up to 3 files.
Please include photos of the suspected species to help potential identification by experts.
Please be specific and give us an address if possible.
//

Take Action

Prevention is the best approach.

Clean, Drain, Dry

Learn about best practices

The Clean Drain Dry program empowers you to help reduce the spread of invasive plants and organisms to BC waters by following the clean, drain, dry procedure on all watercraft and equipment.

Play Clean Go

PlayCleanGo

Learn about best practices

Plantwise

Plantwise

Learn about best practices

A few non-invasive alternatives to plant instead of Yellow Flag Iris include:

Go Further

Identify

Help protect BC from Invasive Species.