"People don't understand what's in our food and how it's been grown. There's a lot of health issues. It's all interconnected in a way, our social problems.
"If we can educate our children about food and how to produce it. It actually saves us money and it's a good thing to know."
Monthly working bees have mustered up to 30 people in one day to work on the garden.
One was held on Sunday with people turning up to plant, harvest, weed and maintain the area.
Mr Holden said the garden would also be getting some help from Veolia which had offered to install a water toby, connected to the city water mains, for use on the gardens.
One of the challenges was to change people's way of thinking and teaching that it was okay to take food for free.
"The produce is here to take. It's free for all. Share thoughtfully, leave some for others," Mr Holden said.
"Everything can be shared and if we open up that gift culture everyone can live with abundance and that's the idea in general."
Mr Holden said how the garden developed was really over the community which owned it.
"There's no laws. Things are going to change and that's the whole thing. We've got to adapt to change." he said.
"I just want to live in a good world, you know?"