Since then more than 1000 native trees have been planted along the banks of the river and within the reserve.
Tui Brewery's on-site nursery has been a hive of activity, with staff planting more seedlings to keep up with demand.
The brewery team has also made improvements to the picnic tables, pathways and driveway in the reserve with funds raised at their various events.
Read more: Tararua tourism benefits from rail riders
Read more: Iconic truck event Show and Shine brings visitors to Tararua
Read more: Research brings call to replace Tararua with former English name
"The Mangatainoka Reserve is located on the banks of the Mangatainoka River, the main water source for the brewery to use in making its beers," says Rosie Rogers, from Tui.
"We're encouraging all visitors staying here to leave the environment in better shape than they found it and now they can also enjoy our new on-site facilities that will make their travel experience more enjoyable."