Herblaw is only available to Runescape members only.
Herblaw is used to make different sorts of potions and poisons.
Before you can use herblaw you need to complete the Druid Ritual Quest.

Identifying Herbs

To identify herbs just simply left click on the unidentified herb in your inventory.
If you are at a high enough level it will allow you to identify the herb,
but if you are not a high enough level then it will say that you can't identify the herb.
Sounds simple enough but it takes a while to find the herbs because they come randomly when you kill monsters.
I personally have noticed that if you go to the ghost town dungeon and kill thugs or chaos druids, they tend to drop low level herbs more often.
Below you will see a table on what level to identify herbs and how much experience you will gain in doing so.

Level Required	Herb	Identify Exp.
3	Guam Leaf	2.5XP
5	Marrantill	3.75XP
10	Tarromin	5XP
20	Herralander	6XP
25	Ranarr Weed	8XP
40	Irit Leaf	?
?	Avantoe	?
?	Kwuarm	?
?	Cadantine	?
?	Dwarf Weed	?

Potion Ingredients

To make potions you first will have to finish the druid ritual, then you will need 3 items.
First you will need to get a vial and fill it with water at either a fountain, a sink, or a well.
Next you will need an identified herb and you will mix the herb with the vial filled with water, this will create a unfinished potion.
Next you will need the last ingredient, which there is a table below to tell you which type of herb/ingredient for which potion type you are making.
Finally to complete your potion add the final ingredient to your unfinished potion.

Ground Ingredients

In poison cure potions and in weapon poison potions you will need grounded ingredients.
You will first need to get a pedistal and mortal which is sold in herblaw stores located on Entrana or in Taverley, vials and eyes of newts are also sold in Taverley.
Next you will need a unicorn horn which you get when you kill a unicorn or you will need a blue dragon scale which you get in the members dungeon or when you kill a blue dragon.
Lastly you will need select the pedistal and mortal and use with the unicorn horn or blue dragon scale to ground it.

Weapon Poison

Potion type		Level	Herb needed	2nd ingredient		Experience Gained
Attack potion		3	Guam Leaf	Eye of Newt		25XP
Cure poison potion		5	Marrentill	Ground unicorn horn		37.5XP
Strength potion		12	Tarromin	Limpwurt root		50XP
Stat restore potion		22	Harralander	Red spider's eggs		63XP
Defense potion		30	Ranarr weed	White Berries		75XP
Restore prayer potion		38	Ranarr weed	Snape Grass		87.5XP
Super attack potion		45	Irit Leaf	Eye of Newt		100XP
Poison antidote		48	Irit Leaf	Ground unicorn horn		106XP
Fishing potion		50	Avantoe	Snape Grass		113XP
Super strength potion		55	Kwuarm	Limpwurt root		125XP
Weapon poison		60	Kwuarm	Ground bluedragon scale		137.5XP
Super defense potion		66	Cadantine	White Berries		150XP
Ranging potion		72	Dwarf weed	Wine of Zamorak		??