Willow

Willow is a plant minimally seen in the How to Train Your Dragon Franchise.

Description
The willow is a tree from the genus Salix, which consists of approximate 400 species of deciduous trees and shrubs, for example Salix acutifolia and Salix alba.

The roots of a willow are very tough, big and have a fast tenacity to live. Their wood is tough and they have slender braches, which tend to bend over the water and touch it. The leaves of a willow are normally elongated, but can also be round or oval, usually with serrated edges.

Function
In the franchise, willow bark is used as medicine, as mentioned in "No Bark, All Bite".

In real life, willow bark is also used for medicine, along with willow leaves. Willows are also used as food for bees, in order to produce honey. It is also used for biomass and biofuel, because of its fast growth. The willow may also be used as a decorative tree in parks.

Dragons: Race to the Edge, Season 6
In the episode "No Bark, All Bite", Stoick gets rid of all the willow bark from Gothi's medicine, because it was brought by Johann, who presumably poisoned it. The other traders who offer to replace Johann don't have willow bark, which makes Stoick leave to find some. Hiccup goes with him and together gather some bark, when they encouter Dragon Flyers, setting islands on fire, making the pair to realize they have been tricked. After, defending Berk, Hiccup gets a new supply of willow bark from Dagur.