The apple tree is a type of tree found on tree soil patches. They can give you apples and logs. This type of tree is quite uncommon and many players have to travel to another island to find one.
You can use an axe to cut down an apple tree. Upon cutting, it will give you 1 log and 1-3 apples. You can also hit the tree with a mallet to get an apple from the tree.
To replant the apple tree you must find tree soil on tree soil patches. Then use a crude-, wooden-, or iron shovel to get a tree seed hole in soil. Then right click on the soil with an apple in your hand to plant the tree.