Plum Tuckered Out
The quest is unlocked after completing The Great Plateau scenario.
"The plum tree tranquilly watching over Kakariko Village has begun to look less vibrant of late. Seeing this, Impa's mood has faded as well. Perhaps fertilizer will help restore its lost splendor."
"Nourished with fertilizer from Princess Zelda, the plum tree returned to its full, flowering glory. Impa seemed much cheerier too—as though the tree's energy was a reflection of her own."