Hello no not yet I am afraid late October Nov. Enjoy your trip.

We visited the garden in February and took the bus. Here's some of what I wrote on my review of Parnell Gardens: There is no admission to visit these gardens from sunrise to sunset; they are in a public park. The gardens were easy to reach with bus #703 ($3.50) at bus stop 7028 from the CBD at Commerce and Fort Street. This bus stops right in front of the garden as does the bus that returns to the CBD. We visited for about 45 minutes in order to catch the bus on its return to the city. The bus stop was easy to find in both locations. Google maps is excellent in pinpointing the exact location of the bus stops. You can find the bus schedule on the Auckland transportation website to minimize waiting at the bus stop. The Auckland War Memorial Museum is excellent and worth a few hours. It is located in park like setting. The greenhouse (Winter Garden) was a nice diversion after our visit. We used the public bus to get to this museum as well. Use google maps to find the bus number opposite the attraction you want to visit. Then research its schedule and route on the Auckland transportation system. Taking the public bus is much cheaper than HOHO bus, especially if there are 2 of you.

Apologies for not replying. I see you have lots of answers from others.

There will be some flowers in August, - it is the end of winter in Auckland, so they won't be at their best. The gardens are still worth a visit. Enjoy

Wouldn't be much to see as it's middle of winter and the plants and roses are dormant.

No it's free

Spring time in Auckland October onwards.