You need to have finished Druidic Ritual and have level 68 Herblore to use yew roots.
From
Farming. You need a level 60 Farming to plant Yew tree. When tree is fully grown, chop tree down and use spade to get tree roots.
Used as an ingredient in Herblore, can be made into a crossbow string, or can be used in a compost bin to make super compost.
Yew roots can be made into a
Antidote (+), you must have level 68
Herblore to make this, by using a Coconut, an Empty vial, and a Toadflax.
0 kg
The roots of the Yew tree.