When growing a spruce tree elevated in the air, its leaves can generate beneath the saplings and ground it was grown on.
Place some dirt in a 2x2 square up in the air.
Place saplings on the dirt and grow them.
Repeat until the leaves grow beneath the saplings.
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We're tracking this issue as MC-41202, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Won't Fix, which means this is considered a bug but won't be fixed. The description of that ticket or the comments might explain the rationale. Please do not leave a comment on the linked ticket.
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I have just noticed that this is a duplicate of an issue resolved as won't fix. Oops.