Would like some assistance in locating this story because I wanted to reread it and now I can't find it.

Fluttershy finds herself caring for a tree that is growing in Applejack's orchard and the tree isn't an apple tree. Applejack wants to cut it down only to discover that the tree is actually a pony turned into a tree by Discord and he changes the tree back to the pony by the end of the story.