Norfolk Wildlife Trust (NWT) has launched a two-year project to crack down on Crassula helmsii - also known as Australian swamp stonecrop.

The non-native plant spreads quickly, covering whole ponds in a dense mat which lowers oxygen levels and prevents other plants from growing.

This threatens the habitats and food sources of native pond-loving plants and animals including frogs, newts and dragonflies.

Norfolk Wildlife Trust volunteers searching for invasive crassula pond weed on the Earsham Estate (Image: NWT) NWT says Crassula is notoriously difficult to eradicate but painstaking work has succeeded in "methodically and meticulously" removing it from

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