I think this would be a really fun idea, and being a wizard it would make sense for us to catalog different magical plant species (particularly if you're a life wizard and/or want to become some kind of arcane botanist). I also can't stress how much I love some of the cheesy humor (hey cheesiness is good every now and again) than goes into some of the entries for the Monstrology and fish logs.
We've read the puns they've made for different kinds of fish and monsters, I wonder what kind of puns KI would have for their plants?