Asian Clam Identification Small, freshwater clams usually less than 2.5cm wide. Their shells are olive to brown with deep concentric rings. The colour can flake off, leaving white patches on the shell surface. Juvenile…
Zebra Mussel Identification Zebra mussels (Dreissena polymorpha) are small, freshwater mussel with a triangular shape, usually 2 – 5cm long. They often have yellowish and brown zigzag banding but colours can vary a lot.…
Parrot´s Feather Identification Parrot´s feather, AKA Milfoil, is a very distinctive looking plant that can grow up to 30cm above the water’s surface, and up to 2m below. It can also invade muddy banks.…
Nuttall’s & Canadian Waterweeds Identification Nuttall´s (Elodea nuttallii) & Canadian (Elodea canadensis) waterweeds are underwater plants attached to bottom by roots. Their thin branching stems can grow 3m or more. The bright green leaves are arranged…
Curly Waterweed Identification Curly waterweed, AKA African Curly Waterweed, grows underwater and is attached to the bottom by roots. Its leaves are arranged in spirals along the stem and are very curled. The stem is hollow…
Water Fern Identification Water fern (Azolla filiculoides), AKA Fairy Fern, is a very distinctive looking, small, floating, moss-like plant. The fern-like leaves are a bright green color with a thin red border. Water runs off the…
New Zealand Pigmyweed Identification Small green weed with leaves (4mm – 2cm long) arranged opposite each other on rigid, round, fleshy stems. New Zealand pigmyweed (Crassula helmsii), AKA Australian Swamp Stonecrop, can grow in three forms: on…
Giant Rhubarb Identification In summer, giant rhubarb (Gunnera tinctoria) has huge leaves up to 1.5m wide. The leaves are lobed and hairy underneath. Prickly, reddish leaf stalks and flower heads grow from stems that…
Himalayan Balsam Identification Himalayan balsam (Impatiens glandulifera), AKA Indian Balsam, Policeman’s Helmet, can grow up to 3m tall. It flowers from late May to October. The pink/purple bonnet shaped flowers are 2.5 - 4cm long. The…
Giant Hogweed Identification Giant hogweed (Heracleum mantegazzianum) is a massive 2 - 5m tall plant with leaves more than 1m wide. The leaves are divided and sharply pointed with soft hairs on the underside.…