City Cast Philly logo

What’s the Deal With Philly’s Moon Tree?

Posted on December 13, 2022   |   Updated on September 30, 2025
Brittany Valentine

Brittany Valentine

If you’ve ever been to Washington Square Park, you’ve probably seen the Moon Tree Plaque. But what exactly is the moon tree? It has a fascinating history, so buckle up!

In 1971, astronaut Stuart Roosa took a voyage to the moon on Apollo XIV carrying with him hundreds of tree seeds. Roosa, who was a former member of the Forest Service, thought that he and NASAcould help plant these seeds across the country upon his return.  


In this way, they could scatter little pieces of “the moon” across the U.S to honor the space exploration program. Guess where the first moon tree was planted? Yep, right here in Philadelphia!  

In the mid 1970s the small sycamore tree was planted a block south of Independence Hall, to commemorate the 200th anniversary of the United States.

Unfortunately, the original tree died in 2008 and was replaced by a clone from the Morris Arboretum in 2011. That clone has withered away as well. Now all that remains is the Bicentennial Plaque which reads “Honoring Earth’s green world of trees.”  

Roosa passed away in 1994 and the Moon Tree Foundation was created to keep his legacy alive. NASA has been keeping track of the trees and published a list of more than 60 first-generation plants that are still live. Most of them are in the states, but some were sent to Brazil and are still thriving. Now you know! 🌳🌝

Share article

Hey Philly

Stay connected to City Cast Philly and get ready to join the local conversation.

Can't subscribe? Turn off your ad blocker and try again.

Philly, Explained

See All
Philly, ExplainedMay 22

Prove Your Weekly Philly Knowledge

Pop quiz, Philly! It’s that time again to test your knowledge on local trivia.

American flag on soil of cemetery
Philly, ExplainedMay 15

Play Our Philly Crossword Puzzle

This mini-crossword is filled with clues on Philly history and headlines.

City Cast Philly Crossword
Philly, ExplainedMay 5

Which Philly Neighborhoods Suffer From a Sidewalk Gap?

A tool from the Delaware Valley Regional Planning Commission can help you track gaps in the Philly area’s sidewalk network.

Map of the Philadelphia region highlighting sidewalk gaps in yellow, red, and green
Philly, ExplainedMay 4

Philadelphia School Board President on Closures: ‘This Decision Wasn’t Taken Lightly’

Reginald Streater described the situation as ‘disheartening’ and said the board tried everything in its power before it reached such a po...

Headshot of Reginald Streater smiling to the camera
Philly, ExplainedApril 22

Land Stewards Union Says It’s All About Empowering Residents

The union is giving residents a collective voice when advocating for their communities and demystifying the Land Bank’s process.

Dominique Johnson stands in front of a vacant lot next to his home.
Philly, ExplainedApril 14

Here’s How You Can Help Grow Philly’s Tree Canopy

Philadelphia’s trees are in major need of maintenance. Tree Tenders can help their neighborhood’s tree canopy thrive.

Volunteers plant trees
Philly, ExplainedMarch 30

What To Know About Philly’s Superfund Sites

The Philadelphia region is home to several hazardous waste sites. Here’s how you can advocate for your community.

The Franklin Slag Pile on Delaware Avenue
Philly, ExplainedMarch 12

Mural Arts Founder Jane Golden on Art as a Medium for Beauty, Opportunity, and Democracy

The founder and executive director of Mural Arts Philadelphia said that the next person who steps into her role should not only be a pers...

Jane Golden painting on the Spring Garden Street Bridge