History: In 1985, a group of volunteers and several organizations joined forces to start Trees Atlanta to address the city's tree loss and create new green space. One year later, the group planted its first 46 trees on Carnegie Way in the heart of downtown Atlanta.

Did you know: Planting season is October through March, and maintenance season is April through September. Trees Atlanta's goal is to plant and conserve more trees and educate the public about the health and environmental benefits that trees provide. Trees Atlanta has planted over 133,000 trees with plans to plant more than 200,000 by 2030 in partnership with 10 metropolitan cities.

Its motto: Trees Atlanta is "dedicated to protecting Atlanta's urban forest through planting, conservation, and education."

How you can help: Volunteers as young as 12 can "dig in" on any given Saturday or weekday to plant trees, provide tree maintenance or participate in forest restoration and other fun projects. Groups are also welcome to contribute on any Saturday project.

To learn more: Visit treesatlanta.org or call 404-522-4097.