But it was his easy-to-understand horticulture methods and obvious passion for "green ideas" that got the students at Wagga Public School (WPS) hanging off Gardening Australia presenter Costa Georgiadis' every word.

He will be at Lutheran Primary School today for its Sustainable Living Festival from 10am.

Yesterday, Mr Georgiadis looked at the school greenhouse made with 1600 plastic bottles compost and herb gardens.

"It's fantastic; this is the message, simple ideas can change the world," he said.

The excitable Mr Georgiadis was a hit with the students, telling them to find their passion, and reminding them it's the simple things that can make a difference.

"I don't like the idea that you're either this 'eco warrior' or you're not," Mr Georgiadis said.

"There are lots of local actions you can do to help the planet plant a native tree, start composting, use less electricity." Mr Georgiadis said that today he would be mixing practical skills with theoretical knowledge about horticulture.

"I'm going to be discussing the 'inspiration garden' and how to make one," he said.

"Then talk about low intensive gardening methods."

Teacher Will Dorrell said the students were excited to show their garden work, which the whole school has shown an "immense passion" for.

Lutheran Primary School parent Annabel Bowcher said it was his easy to understand message that electrified students and the school community.

"We haven't been able to drag him away," she said.

"His enthusiasm is infectious."