Arrowtown Trust chairman David Clarke said many of the plants had been donated by Arrowtown resident Anne Bain and the Heritage Roses committee.
The planting was part of the greater landscaping plan for the site, located off Romans Lane, directly behind Provisions cafe.
On completion the landscaping would include a picket fence, and a hedge to delineate the two properties.
This would allow people to walk from Romans Lane to the cafe.
Inside the building the original baltic pine floor had been restored, a new kitchenette and new toilet had been constructed and rotten weatherboards replaced.
Some painting and lighting installation was still to be done.
While there were no firm plans for a tenant in the building, Mr Clarke hoped it might be a home for the arts in Arrowtown.
The former community hall, which had been attached to the historic St John's Presbyterian Church since 1959, was moved to the site in June.
