Herblore

Herblore is a skill that involves making potions from a vial of water, a herb, and a tertiary ingredient. You can use a Brown spice and stew to boost your level by up to 5.

Cleaning herbs
Cleaning Herbs is a simple task you have to perform before you can add an herb to a vial to create an unfinished potion.

Boosts
Herblore can be temporarily boosted through the use of spicy stew, the Herblore cape, greenman's ale and greenman's ale (m)

By eating a spicy stew (made by adding brown spice to a stew), herblore can be boosted +5 or -5. However, a +5 boost in any skill is quite rare and a +5 boost is commonly sought after. Greenman's ale (purchased in Yanille bar) boosts herblore by 1, and the matured version of the ale boosts herblore by 2, however the matured version can be quite expensive.

Potions
Once you add a herb to a vial of water, you get an unfinished potion; you must add a tertiary ingredient to finish the potion completely.