The Simpsons (1989): Season 24, Episode 6

24 - 6: A Tree Grows in Springfield

Lisa tries to cheer up a down-in-the-dumps Homer by winning him a "MyPad" at the school auction. But he falls back into a funk when he breaks the magical tablet device - until Ned Flanders discovers a miracle tree in the Simpsons' backyard with bark that spells the word "HOPE".