Holy Trinity Lutheran School students planted trees at school in Horsham with the Wimmera Catchment Management Authority.

Laharum Primary School and Horsham Special School students planted trees with Laharum Landcare Group.

Wimmera CMA conservation volunteers partnerships project officer Jody Taberner said Holy Trinity students planted a tree each.

"It was a great opportunity for the students to be involved in a national community event that will make a difference and enhance the school environment," she said.

"Plants will act like a windbreak and beautify the grounds.

"The school is in an environmentally sensitive location near the Wimmera River, so for that reason we chose plants to reflect species that would have grown there originally."

She said Schools Tree Day was a great way for young people to make a difference to their own environment.

Holy Trinity Lutheran School acting principal Jason Przibilla said students took great pride in their school and its grounds.

"The opportunity for them to plant trees enabled them to take ownership of improving their school environment," he said.

"It will be great in the future when students visit the school they will be able to see their footprint on the environment."

Laharum Primary School and Horsham Special School students planted about 1000 trees near Potter Creek in Laharum.

Laharum Landcare representative Wendy McInnes said the students really enjoyed the day.

"Children need to have a good experience with caring and adding to the environment," she said.

"If they do it at a young age, they will have good memories later on and hopefully share their experiences with their children.

"It's all about encouraging more people to help the environment."

She said students spread seeds as well as planted trees.

"We had a production line going on at one stage," she said.

"The seeds they spread will germinate over time, giving the area more plants," she said.