About 1.5 million trees were planted by volunteers on Sunday as part of National Tree Day and it's not just the environment that will benefit.
The wellbeing of people particularly in metropolitan areas can improve if they "get out in nature" and plant trees, Sara McGregor from organisers Planet Ark said.
"Especially in these days of a lot of screen time, people working longer hours, people are now living in flats and apartments," she told AAP on Sunday.
"It really is maintaining that link with nature."
Increased academic performance, reduced levels of depression and quicker recoveries for hospital patients have all been linked to exposure to nature, Ms McGregor said.
During the 17 years National Tree Day has been celebrated, about 20 million trees have been planted.
Previously only natives species featured, but this year any variety is accepted.
"Nature is good for us. Trees are good for us and obviously they're good for the environment too," Ms McGregor said.
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