Aquatic Weeds

Day 5 – Aquatic Weeds

Did you know…? Montana’s state weed list also includes aquatic invasive plant species! Some plants are submerged, while others are not. The state list has eight (8) aquatic invasive plant species listed:

  • Priority 1B: Purple loosestrife
  • Priority 2A: Yellowflag iris, Eurasian watermilfoil, Flowering rush
  • Priority 2B: Curlyleaf Pondweed
  • Regulatory (3): Hydrilla, Brazilian waterweed, Parrot feather watermilfoil


For Day 5 of MNWAW, we will learn about three of the eight species: Eurasian watermilfoil, Curlyleaf pondweed, Yellowflag iris. Use these resources to learn something new and/or as a way to promote and distribute information to your constituents, family, friends, and neighbors.

Fact Sheets
Eurasian Watermilfoil—MSU Extension
Curlyleaf Pondweed—MSU Extension
Yellowflag Iris—MSU Extension


Eurasian Watermilfoil—Lower Hudson PRISM
Eurasian Watermilfoil—University of Idaho
Curlyleaf Pondweed—MT Department of Agriculture
Curlyleaf Pondweed—University of Idaho
Yellowflag Iris—MT Department of Agriculture
Yellowflag Iris—University of Idaho
Eurasian Watermilfoil from a hot spring—Explore Biodiversity; Rob Nelson


Activities & Helpful Websites
Help Protect Montana from Aquatic Invasive Species activity book—Montana FWP
Aquatic Invasive Species Singalong—Invasive Species Action Network


Other Articles & Information
AIS Species Identification Guide—Montana FWP
Protect Montana Waters from Aquatic Invasive Species—Montana FWP
Eurasian Watermilfoil—Montana Outdoors


As MNWAW is declared statewide, help us create a united front in the fight against noxious weeds in Montana, educate those around us, and celebrate the wins. Don’t forget to watch our gun raffle fundraiser LIVE on our Facebook page at 5pm.

Follow along, share, and engage with us!!

Weed Whackers Ball 2023

Weed Whackers Ball 2023


The 16th Annual Weed Whackers Ball is happening soon!
For more information, click here.

Featured Partners

Upcoming Events

Upcoming Events


Montana Noxious Weed Awareness Week
June 4th – June 10th, 2023
Click Here