Didymo, also known as "rock snot" is a freshwater diatom (a type of alga). Didymo is currently found in a number of South Island rivers.
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Eel grass has been declared a total control pest plant throughout the Marlborough region. It has a limited distribution and density.
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Egeria is a surveillance pest plant in Marlborough. Council is aware that this pest poses a risk within Marlborough.
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Lagarosiphon is a surveillance pest plant in the Marlborough region. Council is aware that this pest poses a risk within Marlborough.
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Parrot’s feather has been declared a total control pest plant throughout the Marlborough region. It has a limited distribution and density.
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Reed sweet grass is a containment control pest plant in the Marlborough District Council's Regional Pest Management Strategy.
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Senegal tea is a perennial, semi-aquatic herb which grows to 1.5 metres when flowering and originates from Central and South America.
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Spartina grass is declared a total control pest plant throughout the Marlborough region. It has a limited distribution and density.
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