Given that the plant i called hearts desire, and it looks quite visually appealing it's possible that it's one of the plants that evolved to be eaten, and tasted pretty good. IT could have easily died down due to overgrazing as pony society started to die off.
But it's unlikely that it's only the hearts desire that causes it - Zecora said she sees them growing around ponyville. Maybe it's the other component of the potion that became rarer?
EDIT: Oh, oops. I didn't get much sleep last night...
But you know, come to think o it, how exactly does the Heart's Desire work? Zecora said that it reveals the hearts desire, right? Is it maybe like a stimulant, causing the pony to go sort of wild for their passions? Or maybe a depressant that removes inhibitions, like alcohol?
Now I'm imagine pure heart's desire being sold like some sort of back-alley drug on the streets of Manehattan, ground up and stuff. And some enterprising stallion decides to try cutting it with ragweed or something to save money. And then Pony!Punisher gets wind of it, and...
goddamnit.
edited 12th Nov '11 10:18:58 AM by kegisak