Forest element is not used often in Little Alchemy, but it is necessary to combine Wild Animal, Wolf, and Wild Boar. Lots of trees make forest, that’s true! To make Forest, you need to make Tree first. That means you need to make Plant, Time, Tree, and then Forest. Check out the detailed instructions and try it yourself.
Air + Water = Rain
Rain + Earth = Plant
Earth + Fire = Lava
Air + Lava = Stone
Air + Stone = Sand
Fire + Sand = Glass
Sand + Glass = Time
Plant + Time = Tree
Tree + Tree = Forest