"At the moment, we're not producing enough organic food to keep up with demand. So selling your produce is an opportunity too good to miss.
"We just need to get a compost system to produce that good, healthy tucker."
Currently, the St Matthew's gardeners use a New Zealand Box composting method -- which Mr Fielding said is difficult to maintain, with waste taking time to fully break down.
"It's quite a masochistic method," he said.
"There's a lot of shovelling involved, which is hard on the spine."
He plans to replace the New Zealand Box with a 'turning' system, based on a product created by one of his students when he was a lecturer at Massey University.
In this system, compost is mixed and aerated as it is passed between two bins with the turn of a handle -- with the oxygen flow breaking down material more quickly.
"You give the machine a couple of cranks, and Bob's your uncle."
Mr Fielding also plans to construct a St Christopher's worm farm, so named as they are made from tyres, referring to St Christopher as a patron saint of travelling.
Worms consume food waste, and the breakdown process produces a liquid which makes a nutrient-rich garden fertiliser.
As both composting items are expensive to buy, Mr Fielding is calling for donations -- large plastic drums to help make up the turning system, old clothes drier doors to cover the worm farm, and trays to catch the worms' leachate.
Food scraps for the worms to feast on would also be welcome.
"Plus, we could do with someone with welding skills to help fit everything together," Mr Fielding said.
"This could also be a good way for the community to recycle things they're not using."
If you wish to help with St Matthew's compost system, call Rev Stephen Kimberley on 06 370 8589.