In the Fruit of the Poisonous Tree, Regina said the apple tree was the only thing she had from her childhood. (That, and her horse, which was still alive at that point since she had yet enacted the curse).
It is curious though that no one in Storybrooke eats from her apple tree. Like, I remember a funny scene from episode 2 when Henry asked where Emma got the apple from, she said it came from his mom and he tossed it. 😆
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