Compost Collective

The Compost Collective can help you get up and running with a composting system to suit your household.

So...why do we need to compost?

Nearly 50% of Waiheke's waste sent to landfill can be composted! Around 10% is from the garden and nearly 40% are food scraps.

Believe it or not, garden & food waste sent to landfill doesn't compost. Instead the liquid it creates moves through the landfill and takes the toxins with it, creating leachate. In order to insure this toxic liquid doesn't leak out and contaminates our waterways the leachate is collected and treated onsite. What a waste of energy!

But it doesn't stop there - another effect of garden and food waste in landfill is the creation of methane (CH4), a potent greenhouse gas. Now some of the modern landfills do collect this gas, however not all of them.

This is where composting can save the day!

Composting WILL reduce the amount of waste we are sending to landfill, but it has so many other benefits too! We want to show you how simple it really is. No questions are too big or too small. To find out when the next composting workshop is click here.

If you are a keen gardener..or not, there is a system of everyone.

Bokashi Composting

This is a method of intensive composting that is particularly well suited for an urban environment due to its fully contained nature, its compact size, and the wide range of food types that can be put into the system.

The food is placed in a sealed self draining bucket system and is then inoculated with Bokashi Effective Micro-organisms (EM), kicking off a fermentation process that pickles the food waste. The application of EM reduces the amount of odour that often occurs when food decomposes.

Once the container is full, the fermented food waste is placed into the ground where it breaks down and becomes compost within weeks. The liquid that collects in the bottom bucket should be tipped down your toilet each week to increase the health of your septic tank and reduce plumbing odours.


Useful Links

Compost Collective -

Claire Mummery - Organic Garden Specialist & Composting Guru

Worm Farms

A self-contained unit (in several different sizes) in which worms eat biodegradable waste. The process uses most types (70%) of food waste mixed with waste paper and cardboard (30%), and produces a soil end product (worm-castings) as well as worm-juice (worm tea); both extremely nutrient rich and excellent for use in gardens.  Worm farms use 2 types of worms, generally either the tiger worm or the red worm.

250g of worms will go through around 200g of food. This is about a cup of food a day. The worms can eat their own body weight each day and as the population grows you will be able to feed them more.

Worms like to eat most fruit and vegetable scraps, but don't particularly like citrus, chili, garlic or onions. They like coffee grounds & tea bags, used paper, egg shells and will also take care of your dust from your vacuum cleaner & hair!

Be careful how much processed foods, flour based foods, such as bread, and cooked foods you give to your worms. They will handle a small amount but would prefer fresh foods.


Useful Links

Compost Collective -

Claire Mummery - Organic Garden Specialist & Composting Guru



The Waiheke Resources Trust manages the Waiheke Compost Collective contract with Kristin Busher as our Waiheke facilitator. Kristin is passionate about sharing the benefits of composting.

"There are so many benefits to composting: Reduced waste to landfill, septic tank health using bokashi juice, and the beautiful, nutrient rich soil you create from food waste! Living sustainably is a journey we are all on and learning to compost is definitely a part of that journey."

The goal of the Compost Collective is to inform and engage as many people as possible about the benefits of composting and help people reduce their kerbside waste. We want to entertain, engage, empower and encourage the community to learn about smart gardening, food waste prevention and waste minimisation.

The Compost Collective supports these United Nations Sustainable Development Goals

WRT's Health and Safety plans are provided by:

The WRT is an Auckland Council accredited service provider: