Hydrilla Found in Michigan for the First Time

October 9, 2023

Hydrilla, an invasive aquatic plant known for its rapid growth and harmful effects on ecosystems, has been found in Michigan, US, for the first time. This discovery was made by the Department of Environment, Great Lakes, and Energy (EGLE) during routine monitoring of private ponds in Berrien Springs, Southwest Michigan. Both Hydrilla and another invasive plant called Parrot Feather, found in the same pond in 2020, are prohibited in Michigan due to their potential environmental threat.

Key Points:

Identification of Hydrilla: Hydrilla is an invasive aquatic plant known for its rapid spread and harmful impact on native ecosystems. It is characterized by long, slender stems floating near the water’s surface, pointed bright green leaves, leaves growing in whorls of five (but ranging from four to eight), tiny floating white flowers in late summer to fall, and small potato-like tubers attached to the roots.

Discovery in Michigan: The Department of Environment, Great Lakes, and Energy (EGLE) identified Hydrilla in two small populations in private ponds in Berrien Springs, Southwest Michigan. These findings were made during routine monitoring for another invasive plant called Parrot Feather, which was discovered in the same pond in 2020.

Prohibited Species: Both Hydrilla and Parrot Feather are prohibited in Michigan, making it unlawful to sell, possess, or import them into the state. They are also on Michigan’s invasive species watch list due to their potential environmental threat.

Reproduction and Spread: Hydrilla is known for its multiple methods of reproduction, allowing it to spread rapidly. It can disperse through water or attach to ornamental plants, potentially introducing the invasive species to new environments.

Habitats and Impact: Hydrilla can grow in various aquatic habitats, including lakes, rivers, reservoirs, wetlands, ponds, and streams. Its rapid growth can quickly fill a waterbody, negatively affecting native plants, wildlife, and recreational access.

Challenges in Eradication: Hydrilla can be challenging to eradicate because it forms tubers and turions that can persist in sediment for years. Additionally, even small fragments of the plant can lead to new growth.

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