Orokonui Ecosanctuary educator Tahu Mackenzie said the sanctuary moved about 2000 plants into the mall for the New Zealand International Science Festival event.
"It's a big celebration of the forest," she said.
The trees, donated by Ribbonwood Nurseries, made the mall look "absolutely spectacular" and the feedback had been positive as "everyone has said it should stay that way".
Along with frog and bug displays, face painting and treasure hunts, Orokonui staff talked about the forest of Tane and what New Zealand used to look like, cultural perceptions of the forest, and how people felt when they were in the forest.
"It's quite interesting, juxtaposing it with Wall Street."