(@no me bré, #25. I just realized the brilliance of that. I didn't get it at first read. Good one.)
I'm not trying to convince anyone that a plant can be holprig. I'm mostly trying to figure why not
(I already understand that it can't be).
So each answer, from each voice, explaining it differently, helps me further.
So looking at it linearly, if there are bumps along that straight line, whether it be speech, writing, streets, hills -- they are "holprig".
@29, Eifelblume, Your version gave me another piece to the puzzle. "Negative Wertung". Holprig is typically a "negative evaluation" of an object/thought/sentence, i.e., it's not smooth, not what one would expect/anticipate, whether tactile or nontactile. That makes sense. I guess others were trying to get that through my head.
THANKS ALL! I'm good. (And no, this is not a study, but it is a laboratory.^^)