I think that there could be a specific plant that a schoolteacher sells, like this:
Fire: Fire Elf's Tree(seen in Fire Elf Animation) Ice: Snowman's Pipe (Tree that sprouts pipes that Evil Snowmen use) Storm: Damproot (roots that grow upward out of the ground with storm clouds above it) Myth: Minotree (Tree that resembles a Minotaur) Life: Blossom's Blossoms (Cherry tree with a Blossom-resembling face) Death: Wilty Weed (Weed that looks like it's always wilting) Balance: Scale Shrub (a bush that has an actual scale that Judgements use perched on top)