Lake Waihola Waipori Wetlands Society chairman Robert Girvan says that glyphosate spraying to kill crack willows in the wetlands has allowed native species to make a comeback. Photos by Hamish MacLean. : Glyphosate helps killing the willows

Lake Waihola Waipori Wetlands Society chairman Robert Girvan shows the leaves of the invasive crack willow. : Glyphosate helps killing the willows

Many people who drive by the Lake Waihola Waipori Wetlands do not know the extent of the wetlands, Mr Girvan says. The remaining glyphosate-sprayed willows were in a position that have made their extraction difficult. : Glyphosate helps killing the willows

Lake Waihola is a shallow, tidal lake that makes it susceptible to reduced water flow and sedimentation. : Glyphosate helps killing the willows

Channels throughout the Lake Waihola Waipori Wetlands have opened up since spraying commenced four years ago, Mr Girvan says. : Glyphosate helps killing the willows