Mrs McLean said the festival offered a great opportunity for amateur gardeners to see how the professionals do it.
"Whether you've got green fingers and are a really keen gardener or whether you are just interested and passionate about the environment and gardens, there are so many different places [gardens]."
Mrs McLean, who helped organise the event, said the variety of gardens was a major drawcard.
There were "quirky, funky" gardens in Freemans Bay, one near Takapuna Beach and one on a mountain side.
"There's something for everyone to enjoy and be inspired by and stimulated by," said Mrs McLean.
Money raised from the festival will go towards charity.
The festival runs from 10am to 4pm today and Sunday.
Those attending can either choose to drive to the properties or book a place on a special bus service.
Tickets are $50, which includes both days, and are available at www.iticket.co.nz.
More information can be found at www.gardendesignfest.co.nz.