The species
produces seeds early in its lifespan, tends to make millions of
viable seeds during its life, and continues to
produce seeds for decades and, in some cases, for more than a century.
«As long as the older trees are not so stressed that they do not
produce many
viable seeds, [and] the dispersal mechanism — for example, wind, birds, mammals — is present, and the habitat where the
seed lands has the appropriate soil, nutrients and temperature,» says biologist Terry Root of Stanford University, who was not involved in the study, «then the trees will be able to shift.»