Any speculation about what would happen if more than one "legendary leaf" were to spawn at Iruma's hand?
This is just a guess but i'll hide it as spoiler
A single leaf might just be a sapling with a normally stupidly long growth period that it would end up looking like a herb, but heck Iruma just grew that vine with a (few) drop(s) of blood. Granted that wine had a special property of growing 30 meters with a drop of water.