trees can be guys or girls or both or neither & i think thats perfect
also, weird choice to give up on seeing whether the moon did anything to trees after such a short time, when trees can live literally hundreds or thousands of years
i think it would be cool to do a Where Are They Now study on the trees & find out that Moon Trees were maybe 60% more likely to have transitioned to female since then than other trees
(cause thats totally a thing trees do sometimes and I think they might do it JUST to make sure there were some lady moon astronauts)