More than five decades ago, Apollo 14 carried an unusual payload into deep space when hundreds of tree seeds accompanied the mission on its journey around the Moon. While astronauts Alan Shepard and Edgar Mitchell explored the lunar surface in February 1971, command module pilot Stuart Roosa remained in lunar orbit with the seeds packed inside his personal kit. After returning safely to Earth, many of the seeds were germinated and planted across the United States, creating what became known as "Moon Trees." Today, these trees can be found in parks, schools, courthouses, universities and government sites, serving as living reminders of one of NASA's most unusual and enduring spaceflight experiments. Their continued growth offers researchers a unique opportunity to study long-term plant development after exposure to space travel.
How the Moon Trees project began
The idea for the experiment came from Stuart Roosa's background before joining NASA. Prior to becoming an astronaut, Roosa worked as a smokejumper for the US Forest Service, parachuting into remote forests to combat wildfires. Ahead of the Apollo 14 mission, the Forest Service partnered with NASA to send several species of tree seeds into space. Forest Service geneticist Stan Krugman selected seeds from loblolly pine, sycamore, sweetgum, redwood and Douglas fir trees for the experiment.
The seeds were sealed inside small containers and placed in Roosa's personal preference kit aboard the command module Kitty Hawk. After returning to Earth, the seeds were germinated to study any effects of space exposure on growth.
A journey around the Moon
Apollo 14 launched on January 31, 1971, becoming the third successful mission to land humans on the Moon.
Although the seeds never touched the lunar surface, they travelled farther than almost any plant material had gone before. While Shepard and Mitchell conducted their activities on the Moon, Roosa and the seeds remained in lunar orbit, circling the Moon before beginning the return trip to Earth.
The seeds experienced launch, deep-space travel, lunar orbit and re-entry, making them part of one of the earliest biological experiments linked to lunar exploration.
What happened after the mission?
Following Apollo 14's return, the seed containers accidentally burst open during post-flight processing, scattering the seeds and raising concerns that the experiment had been ruined.
Scientists recovered the seeds and began germination tests. Despite the mishap, many of the seeds sprouted successfully. Researchers later compared the space-flown seeds with control seeds that had remained on Earth and found no significant differences in growth or appearance.
The trees looked completely normal, which was an important finding. Space travel had not visibly altered their development.
Scientists also monitored many of the trees for years after planting to determine whether exposure to space conditions had caused any genetic mutations or developmental abnormalities.
The long-term observations found no measurable differences between the Moon Trees and their Earth-bound counterparts, reinforcing the resilience of seeds during spaceflight.
Where are the Moon Trees today?
By the mid-1970s, the young trees were ready to be distributed and planted. Many were dedicated during America's bicentennial celebrations in 1975 and 1976.
Moon Trees were planted at locations including the White House, NASA facilities, state capitols, universities, schools, parks and memorial sites. Some were even sent overseas to countries such as Brazil, Switzerland and Japan.
Today, many of these trees remain standing across the US. However, no complete master record was maintained, making it difficult to determine exactly how many original Moon Trees survive.
Why most people never notice them
One reason the Moon Trees remain relatively unknown is that they look no different from any other mature tree. A sycamore, pine or redwood grown from a seed that orbited the Moon appears almost identical to one grown entirely on Earth.
In many cases, only a small plaque identifies the tree's remarkable history. Over time, some plaques have disappeared, and the story behind certain Moon Trees has been forgotten.
As a result, countless people walk beneath these living spaceflight relics without realising their connection to Apollo 14.
The legacy lives on through Artemis
The success of the Apollo 14 experiment inspired NASA to revisit the concept during its Artemis programme.
Tree seeds were flown aboard Artemis I, which travelled thousands of miles beyond the Moon before returning to Earth. NASA and the US Forest Service later distributed Artemis Moon Tree seedlings to schools, museums, universities and public institutions across the country.
The programme continues the tradition of connecting space exploration with everyday life by turning a journey through deep space into something that can grow in local communities.
A living reminder of the Apollo era
Unlike spacecraft, moon rocks or museum exhibits, Moon Trees are living monuments. They continue to grow, provide shade and change with the seasons while carrying a direct connection to one of humanity's most ambitious periods of exploration.
More than 50 years after Apollo 14, these trees remain a unique symbol of how a small experiment conducted during the space race created a lasting legacy rooted firmly on Earth.
Most monuments to the space age are behind glass or bolted to a wall. The Moon Trees are outside, growing quietly in schoolyards and courthouse squares, asking nothing except to be noticed which, for trees that have orbited the Moon, seems like a reasonable enough request.
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