Table of contents

Introduction

Invasive aquatic plants are non-native plant species introduced into aquatic habitats. As these plants rapidly reproduce, they can reduce the habitat of native plant species, threatening fish, insect and animal species in turn, and disrupting the overall biological diversity of ecosystems. Invasive aquatic plants can also affect water quality and interfere with recreational opportunities.

Common invasive aquatic plant species

Eurasian watermilfoil
Eurasian watermilfoil (Myriophyllum spicatum) can outshade native plants and reduce water oxygen levels.
Flowering rush
Flowering rush (Butomus umbellatus) can reduce irrigation water availability and impede aquatic activities like boating or swimming.
Himalayan balsam
Introduced as an ornamental plant, Himalayan balsam (Impatiens glandulifera) can reduce habitat for native wetland plant and animal species.
Pale yellow iris
Pale yellow iris (Iris pseudacorus) is a poisonous invasive plant that can have serious impacts on wetlands and watercourses.
Phragmites
Even with limited distribution, Phragmites (Phragmites australis australis) can outcompete native plants in locations where it takes hold.
Purple loosestrife
Stands of purple loosestrife (Lythrum salicaria) can disrupt water quantity and quality, and negatively impact aquatic habitats.

Help stop the spread of invasive plants

Report aquatic invasive species:

Learn more about identifying and preventing invasive aquatic plants:

Spread the word about the threats invasive plants pose:

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