It can be grown in a pet's front or back garden by purchasing the Limited Edition Playfish Cash Golden Apple Tree Seed at the Outdoor Store. This tree seed was only available for purchase from September 1, 2010 until September 2, 2010.
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 fruits on the tree at once, unless you have the Fruit Fairy, in which case you can have four fruits.