That phrase got me confused: there are several other "species" of cultivated plants that are actually clones of a single mutant plant, most famously the Cavendi

That phrase got me confused: there are several other "species" of cultivated plants that are actually clones of a single mutant plant, most famously the Cavendish banana. But "seedlings" suggests that this mutant cedar can pass on the mutation when reproduced from seeds, not only through cloning? Actually, I suspect that the main reason why this is not doable at scale is the amount of manual labor involved - cutting off the offshoots without damaging the tree below sounds like quite a challenge...