via NASA:

‘Apollo 14 launched in the late afternoon of January 31, 1971 on what was to be our third trip to the lunar surface. Five days later Alan Shepard and Edgar Mitchell walked on the Moon while Stuart Roosa, a former U.S. Forest Service smoke jumper, orbited above in the command module. Packed in small containers in Roosa’s personal kit were hundreds of tree seeds, part of a joint NASA/USFS project. Upon return to Earth, the seeds were germinated by the Forest Service. Known as the “Moon Trees”, the resulting seedlings were planted throughout the United States (often as part of the nation’s bicentennial in 1976) and the world. They stand as a tribute to astronaut Roosa and the Apollo program.…

Sadly, Stuart Roosa passed away in December, 1994. The Moon Trees continue to flourish, a living monument to our first visits to the Moon and a fitting memorial to Stuart Roosa. Believed locations of some Moon Trees are listed below, but no list was ever kept nor any systematic tracking made of the disposition of all the trees. If you know of a Moon Tree, please send a message to dave.williams@nasa.gov…’