It is grown in a pet's garden from the limited time Birthday Cake Tree Seed which was sold for one day only at the Garden Shop on Tuesday, August 9th, 2011. After planting, it will take 72 hours for the tree to reach maturity. Afterward, the tree will begin producing fruit, one fruit at a time, randomly. A pet can have up to three total apples on the tree at once, unless you have the Fruit Fairy, in which case you will produce up to four.