If you have travelled the Downhill Walkway from the Cable Car entrance, you will have left the Main Garden through the Founder's Entrance, and re-entered the garden via the Centennial Entrance. You will come to the car park, and as soon as you see the rose garden, you will see a map board on your right, next to the bank. This is the starting point.
If you have come up from the city, via the Bolton Street Memorial Park, head towards the Rose Garden car park and again, look for the map board on the left, on the far side of the garden.
If you have come down from the Herb Garden on the preferred route, turn left when you reach the drive and proceed to the map board start, again on the left.
There is a regular bus service from the centre of the city. Catch a Karori Park No 3 bus to the main (Founders) Entrance. As you alight the bus, turn left for the rose garden and begonia house; right for the Main Garden. Buses run every 10 to 15 minutes.