Yellow Flag Iris Patrol

If left to invade, Yellow Flag Iris...

takes over wetlands, forming dense stands which displace native plants and animals. Once established in an area Yellow Flag Iris becomes very difficult to remove. It spreads by seed and rhizome fragments which float away to form new plants. The rhizomes also creep along the bottom of the wetland, slowly expanding the colony, choking out wetlands and blocking water flow. In addition, it is toxic to grazing animals, and its resins cause skin irritation in humans.

To learn more about Yellow Flag Iris, visit our species info page.

How much Yellow Flag Iris is in the Sea to Sky, and where?

Yellow Flag Iris has been found in Alta Lake, Green Lake, Anderson Lake, the River of Golden Dreams, Wilson Slough, the Squamish River, and the Squamish Estuary. Since 2015, we have removed over 1180m2 of Yellow Flag iris from sites across the region. See maps below for known locations in the region.

What is the Yellow Flag Iris Patrol?

The Sea to Sky Invasive Species council works with eco-tourism companies to track and prevent the spread of the invasive Yellow Flag Iris. We provide free training to canoe, kayak, jet boat, and SUP guides on how to spot and identify Yellow Flag Iris. Guides keep an eye out for this invasive plant while eco-touring in our local wetlands throughout the summer. Guides record sightings on the waterproof maps provided, and report them to the Sea to Sky Invasive Species Council (SSISC). SSISC then removes the invader at reported sites. Your willingness to help and ability to spot Yellow Flag Iris in our lakes and waterways is extremely helpful. It allows the SSISC to respond and remove Yellow Flag Iris infestations before they spread and take over our natural ecosystems.

How do I sign up?

Simply contact SSISC, and we will work with you to arrange a time and place for Yellow Flag Iris Patrol training. Training requires 5-10 minutes of your time during which a SSISC staff member teaches the guides how to identify and report Yellow Flag Iris. We will come to your location! Please let us know if you are interested in this opportunity to actively engage in local wetland stewardship! The Guides of the following businesses have been trained in how to identify and report Yellow Flag Iris. They have taken the initiative to help preserve our natural wetlands in the Sea to Sky.

Sign Me Up!

Request a training session for your Guides