"We live in paradise. This is paradise. I'm working in paradise and humanity has a responsibility to take action and respect the world that we live in."
The plants represented a significant investment and it was important they survived, especially with the recent hot weather, she said.
"When that happens that really dries everything out so this is a real problem for the future ... we've just got to keep at it."
The society's work could be compared to guardianship of a parent.
"Giving birth is the easy bit but it's the nurturing over the next 18 years which is the real commitment - planting is the easy bit, but it is the nurturing where you must make sure."
Wetlands were good at taking the "nasties" out of any form of catchment and it was hoped treated water from the wastewater plant could eventually be used in the wetland if consent was eventually approved, Mrs Greathead said.
"Wetlands are the lungs of our land and we want to create an environmentally sustainable system and if we can create that in our waste water treatment plant, wouldn't that be wonderful?"
About 30 volunteers were actively involved in the project but more would be welcomed, Mrs Greathead said.
"This is the community taking responsibility."