Huorn Leaf

Huorn Leaf, contrary to its name, is not harvested off huorns (breaking the leaves of a huorn is impossible). Rather, it is a plant that can be found growing on the forest floor of Fangorn.

The Huorn Leaf is used to create golden Ent Draught, which can be used to hire huorns (by right-clicking saplings with Ent Draught in hand) and summoning them when needed (by drinking the Ent Draught).

For more information on huorns and how to hire them, go here.