Tree

Trees are the most common form of natural-type decorations. There are four types: oak tree, pine tree, palm tree and Squidport tree, each with varying colours, all of which are a convenient size of 2x2 (except Squidport one which is 1x1). Trees are also the easiest way to raise your Tree-hugging rating on your Conform-O-Meter, the second being to use Shrubs.

There are also special types of premium trees, such as the Apple Tree, Orange Tree and Tree Swing. The Lemon Tree can also be acquired, but only from winning it in a Mystery Box.

In the Winter update, all of the trees lost their leaves except for pine trees.

In the Squidport Update, a tree was added that can only placed on a Boardwalk Section. It's in a pot, size of 1x1 and cost $385.

In the Krustyland update, a new tree was added - a palm fan tree. It can be placed in the player's Krustyland and also in Springfield, but only in the beach area adjecent to the ocean. The pam fan tree costs $675 in to place in your Springfield, but you must be at least Level 21 and have completed The Krusty-est Place On Earth Pt.8  quest. The palm fan tree costs 125 Krustyland Tickets like the rest of the Krustyland Trees when placed in Krustyland. This tree doesn't raise the players tree hugging rating when placed in Springfield like the other trees. It instead raises the players vanity rating, which is most likely because it is more of a decorative tree compared to the more natural looking ones.

Treehouse of Horror XXIV Event
For the Treehouse of Horror XXIV Event, the two types of oak tree in the game had their leaves stripped.

Jobs Involved
Lisa Simpson Seymour Skinner
 * Read a Book - 45s
 * Go Bird Watching - 24h

Trivia

 * It is the decoration with the most types.
 * During the Treehouse of Horror XXIV Event, the trees had no leaves anymore.
 * During the Christmas 2013 Event, the trees had no leaves, and some we're decorated with Christmas-themed lights of different colors. Other didn't even had any decoration.