RuneScape Classic Wiki
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The main RuneScape Wiki has an article on: Bark sample
The Old School RuneScape Wiki also has an article on Bark sample.

A Bark sample is a piece of the dying Grand Tree which is given to the player by King Narnode Shareen at the beginning of the Grand Tree quest. The player must take it to Hazelmere in order to find out why the tree is dying. Hazelmere will take the bark sample from the player's inventory when they talk to him.

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