In 2008, they began the financially and physically demanding job of creating the Dragonfly Springs Wetland Sanctuary, with its three large freshwater ponds and thousands of native plants that Mrs Busck raised from seedlings.
The mangrove-fringed, zoned "residential one" land contains at least 14 freshwater springs and also collects run-off from the Church St ridge in a system installed by the Buscks.
Stormwater had previously "been piped straight into the tide," Mrs Busck said.
Help developing Dragonfly Springs has come through community-involved working bees and Corrections Department community hours.
"We intend giving it away in some kind of community trust but are not at that point yet," Mrs Busck said. "When we do pass it on we want it to be self-sustaining."
To minimise vandalism, stray animals and predators, but particularly for safety reasons, Dragonfly Springs has a surrounding 2m high fence and locked gates.
Access to Sunday's event, from 12pm to 4pm, is via the gates at the end of Raumati Cres.