Usually saplings, and usually done using sheer man-(and woman)power, but I’m certain that there are tractor attachments for planting en masse too. Drones are beginning to enter the mix as well, but this isn’t really applicable as to what you’re asking.
I think I know what story you’re on about — you can spend an entire summer planting over many, many acres [if you have the time for it](https://youtu.be/AbA-hoIuHM4).
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