The penguin trust donated about 200 plants from its nursery to help revegetate a grassy area at the start of the wetlands' walkway and around the first pond.
The planting day was a chance for both trusts to collaborate and learn from each other.
Mr Riley said he had a great experience helping the trust with its nest count during summer and wanted to return the favour.
Mr McFarlane said Dunedin conservation agencies could further progress their conservation goals by helping each other and sharing skills.
''It's been an excellent day.''