These are the herbs that Pendragon has in his inventory that he actually uses in spells (the attributes shown for each herb come from Scott Cunningham's Encyclopedia of Magickal Herbs):

Anise star   —   protection, purification, youth

Bayberry bark   —   wealth, good luck, domestic peace, fertility

Blessed (holy) thistle   —   purification

Burdock   —   protection, healing

Caraway seed   —   protection, lust, health, anti-theft, mental powers

Comfrey leaf   —   safety during travel; money

Dill   —   protection, money, lust, love

Eyebright   —   mental powers, psychic powers

Fennel seed   —   protection, healing, purification

Galangal root   —   protection, lust, health, money, psychic powers

Garlic   —   protection, healing, lust, anti-theft

Hyssop   —   purification, protection

Juniper berries   —   protection, anti-theft, health

Linden flowers   —   protection, immortality, luck, love, sleep

Mugwort   —   strength, psychic powers, protection, prophetic dreams, healing, astral projection

Pennyroyal   —   strength, protection, peace

Peppermint   —   purification, sleep, healing, psychic powers

Sage   —   immortality, longevity, wisdom, protection

Wormwood   —   psychic powers, protection, calling spirits

Yarrow flowers   —   courage, psychic powers