The Loki Tree is a type of tree only mentioned in The TV series Dragons: Riders of Berk episode, "We Are Family, Part 2". The tree was was never shown, but it was mentioned by Gobber. The drab trees seen around Outcast Island can be assumed to be Loki Trees.
Burned Loki Tree seems to have a horrible smell, beyond the usual burn smell. It is unclear if the live tree is malodorous as well, or only when burned.
This type of tree grows only in one place: Outcast Island, according to Gobber and Stoick. Since Outcast Island is a dry and rocky area, this might suggest that the Loki tree doesn't need much moisture or organic material to grow.
In "We Are Family, Part 2", when Stoick, Gobber and the gang come to the Isle of Night to look for Hiccup, the gang come across the fake Night Fury. Before anyone could stop them, Ruffnut and Tuffnut blow it up. When Stoick and Gobber arrive questioning if they found something, they reply that they found a fake Night Fury that was blown to pieces by Ruffnut and Tuffnut. Gobber examines a piece of the blown up Night Fury, and says that it was made of dragon skin, and then covered with the ash of a charred Loki tree. When Snotlout says that he has never heard of such a tree, Stoick and Gobber reply together that this tree grows only in one place- Outcast Island. Hence they conclude that Hiccup and Toothless are on Outcast Island.
- In Episode 16 "Defiant One" of Dragons: Riders of Berk, some trees are shown on Outcast Island. It is possible that these are Loki trees.
- The name of this tree is named after the Norse god Loki.