Mr Vane, owner of Trail Street Coffee Shop, has been donating coffee ground and food scraps to Mount Austin High School at 7.30am for about five years.

The donated food waste makes up a large proportion of manure for the gardens and also goes towards animal feed.

This cafe joins other businesses across the city that are doing their bit to limit single-use plastics, cut down on items destined for landfill and recycle as much as possible.

"The mini farm at Mount Austin High uses the coffee ground to generate worms in the grounds up there," Mr Vane said.

"Lately we've been taking food scraps and making a compost along with the coffee grounds and it's amazing to see the amount of worms up there.

"It's then used to create a soil for all their plants."

Mr Vane said the small business is producing up to one tonne of coffee ground a month, saving it from ending up in landfill.

MAHS farm manager Chris Lashbrook said the coffee grounds and worms form a manure that is effective in growing plants quickly.

"It's all organic and so it breaks down and creates new soil and it's teaching the kids to recycle," he said.

"I've been starting to use it in the gardens and it certainly grows stuff.

"I wish I started doing this 40 years ago."

The school's relieving deputy principal Anthony Hogan said this initiative has united members of the community, such as residents from The Haven who have been able to do some gardening and meet some of the farm animals.

"It's a good community initiative," Mr Hogan said.

"Our raised garden beds have meant that residents can do some gardening from their chair ... it brings them alive.

"It actually costs us a bit to buy mulch ... so this is a tangible saver for us."

Trail Street Coffee Shop's head chef Evan Garbutt said hopefully these small business initiatives will encourage other companies to get on board.

"I think it's very important these days to be sustainable," Mr Garbutt said.

"Even though we're a small business, every business should get involved and do their part as it will make a difference at the end of the day."

Similarly, Mock Orange cafe in Lake Albert donates its food scraps and coffee ground to local farmers and coffee cup lids for local school initiatives.

Wagga's OzHarvest receives food donations from a variety of businesses across the city, including Aldi, Baker's Delight, Bernadi's, the RSL Club, Woolworths and Wagga Hot Bake.

OzHarvest's mission is to fight food waste by collecting quality excess food from commercial outlets and then delivering it directly to charities that support people in need across the country.