Apples are one of the first items you create in the game. You begin the game with two apple trees, and this may be all you need throughout the entire game because their crafting time is so fast.
To find out more about apples specifically, such as their pricing and the recipes in which they're used, check out the page about Apples.
Available to buy at level:
First and Second: 25 royal coin, Third: 5 Crowns, Unknown Crowns thereafter
Time to build after purchase:
Maximum number per kingdom: