This article is about the cleaned herb. For the grimy herb, see Grimy dwarf weed
Dwarf weed is the second highest level herb. Cleaning dwarf weed requires level 70 herblore and yields 13.8 Herblore experience. It is used with wine of Zamorak to create ranging potions. To create a potion, you need to add the cleaned herb to a vial of water to create a dwarf weed potion (unf), and then add the secondary ingredient.
One way to obtain dwarf weed is by planting dwarf weed seed in a herb patch at level 79 farming. This gives you grimy dwarf weed which you can clean to obtain clean dwarf weed.
According to the book Gielinor's flora - herbs, it is found naturally in entrances to dwarven tunnels, and is not known why it thrived in such a specific environment.
For an exhaustive list of all known sources for this item, see here