When I read plantains, my mind immediately thought of a new harvestable that would likely just be cloned from the banana tree with little change (though fried plantains = <3).
I've heard about the Plant-sim rumors for weeks. Looks like they're confirmed now, and I'm pretty happy. I never played with them in my limited (read: playing at a friend's house, with the base game at that) TS2 experience, but I hope I can have some fun with them.