Local children planted 300 trees with celebrity gardener Costa Georgiadis at Bushcare's Major Day Out on the weekend.
The trees were planted in Catalina Park within the new Middleton Grange housing estate near Liverpool.
On the day 100 residents and members of the community also enjoyed a bird watching bushwalk, theatre birds, wildlife display and barbecue.
"It not only benefits native plants and animals," Georgiadis said.
“One of the most valuable things we have in our suburbs are the bush corridors. If we are to have a healthy community, we also need a healthy ecosystem.”
This event was organised by Liverpool City Council and the National Parks Association of NSW.
Bushcare's Major Day Out was created by Don Wilson who wanted to promote the “amazing work” that volunteer bushcarers do across the country.
"I have seen sites strangled with weeds and after a bit of TLC and helping natives grow, the local wildlife returns,” he said. “It is so rewarding.”