Blackbird kites will be installed at the garden to protect the goldfish, which have been decimated by shags over the past year.
The kites and heaters have been made possible due to revenue from the higher-than-expected visitor numbers.
Dunedin City Council community life general manager Graeme Hall said the garden had been "very popular" in its first year.
The council had targeted to make $1000 a day over the course of the year, but instead made, on average, $1300 a day.
In the 12 months to this week, 84,193 people had visited, compared with the 50,000 target in the council's annual plan.
Visitor numbers had dropped in the past couple of months, with just 1719 people visiting the garden in June.
Mr Hall said the garden was expected to be quieter over the winter months.
The council's target for the next year was 60,000 visitors, as numbers were expected to drop off after the initial excitement.
The higher-than-expected takings had allowed heat pumps to be installed in rooms of the garden and plans made for activities specifically for season ticket holders.
Extra staff had been hired.
The council is looking for a manager for the garden after the resignation of Siew Gek Sim last month.
Mr Hall said the first year of the garden had been a "learning experience" as staff learnt how best to run the garden and cater for visitors.
The next few years would see an ongoing programme of maintenance, including by Chinese artisans in about five years' time
Visitor numbers
July 2008* 8211
August 2008* 8383
September 2008* 9568
October 2008 9470
November 2008 6778
December 2008 8358
January 2009 13,188 (includes 3948 people who visited on Chinese New Year)
February 2009 5894
March 2009 5001
April 2009 5242
May 2009 2381
June 2009 1719
* In July, August and September, 2008 season ticket holders who visited more than once were only recorded on their first visit. Since that time, season ticket holders have had their first, and any subsequent visits recorded. About 11,300 season tickets have been sold.
