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Cultus Lake Yellow Flag-Iris Mapping Project

Cultus Lake Yellow Flag-Iris Mapping Project

Posted Date: October 10, 2021

The Fraser Valley Invasive Species Society (FVISS) and the Cultus Lake Stewards (CLASS) are seeking observations of Yellow Flag-Iris (Iris pseudacoru) around Cultus Lake. YFI is an aquatic perennial plant that grows in clumps, forming dense mats in riparian areas like slow-moving streams and marshes. This plant out-compete native vegetation and restricts water movement, which can have detrimental effects on fish and waterfowl who use the riparian spaces.

In order for us to start managing this invasive plant, we first need to know where the plants are located. Once the locations are known, we can return to clip seed heads in late-summer and begin planning for removing the plants. So get your boat, canoe, kayak or SUP - Help us map this aquatic invasive plant!

Anyone can participate using the phone application iNaturalist, which can be downloaded from either the Apple App Store or Google Play store. Once you have downloaded the app and created a profile, you can find the Cultus Lake - Yellow Flag-Iris Mapping project and sign up to be a member. Then you can go ahead and start observing!

To help make mapping of YFI easier to accomplish, we have split upthe shoreline of Cultus Lake into 7 sections. For this project, you can choose to survey just one of the sections or more.

In order to make sure we are surveying all of the Cultus Lake shoreline, we ask all of those participating to fill out the form below to indicate where they plan to survey.

The best time to head out is during July! Head out on the lake, make your observations and add them to the FVISS iNaturalist project. And of course, have fun out on the water!