Nuadasaid: Ancient Drewsaid: It's possible that bankers have access to a mini-dimension or some plane which theoretically has infinite space and is frozen in time. I don't think that seeds can grow into saplings in the bank. But I would be interested in seeing what they've got to do it.
Yeah, I don't know how much Jagex has thought about the lore of banks...
Which raises another point - why are some items unable to be banked?
Well, at least I know what to ask at the next Lore Corner.
About items: The banker simply refuses to take it. Presumably they have rules that forbid certain items. I don't know what's so special about eg. XP lamps/stars, they take much weirder stuff.