Here are some common herbal oils and their psychic,spiritual or healing uses.  This is not an exhaustive list, this is the most common herbs in use by psychics.

Birch: A good anti-inflammatory and respiratory herb, Birch is grounding and opens spiritual and creative channels.

Cedarwood: A good aid to meditation, calms aggressive or angry thoughts, grounding. A good protective herb for those under psychic attack, or who have weakened auras. Cedarwood brings the body into balance, helpful with respiratory ailments.

Chamomile: Commonly used as a night-time tea and chamomile is a powerful anti-inflammatory oil. Good for insomnia, headaches, calming hypersensitivity, restlessness, depression, anger and fear. Improves appetite, soothing to skin. Avoid during pregnancy.

Cinnamon: An oil long associated with prosperity, it is a powerful purifier, burning away negativity and confused thoughts.

Fennel: Protects against negative thoughts and may be helpful in warding off psychic attack.

Jasmine: Relieves depression, lightens the mood. Cleanses the aura and brightens the emotions. 

Juniper: Strengthens the nervous system, helps restore strength after stress. Cleansing, anti-toxin, digestive aid, liver cleanser. May assist menstrual pains. 6-10 drops in bath to calm, ease fatigue and lower stress levels. Do not use if pregnant or if you have kidney disorders.

Lavender: The queen of oils - a good all-purpose healer. If you are not sure which oil to use, definitely try lavender. Calms but stimulates. 3 drops on a pillow assists in a good night sleep. Be aware that using too much Lavender may keep you awake however.6-10 drops in bath to calm, ease fatigue and lower stress levels.

Marjoram: Calms, strengthens, and helps you confront personal issues. Is helpful in healing grief after loss. Calming to hyperactive people. Combine with Lavender and Peppermint to combat headaches. 6-10 drops in bath water,

Mugwort: Calms, helps in meditation, heightens psychic sensitivity, and may promote astral experiences.

Patchouli: Opens the heart center - is commonly used as a love or passion oil. May be used to attract a loving mate.

Peppermint: A good anti-anxiety herb, peppermint also is good at fighting nausea and car-sickness. Mix half and half with lavender for use in calming migraines.

Rose: Rose oil is incredibly uplifting, being sacred to the goddess Venus

Sage: Sage is often used as an aid to meditation, to ease depression, and the dried sage herb is often burned to purify the home of negativity and unwanted energies. Sage is calming and peaceful, and may enhance and clarify psychic impressions.

Yarrow: Use to  to drive off energies that are not your own, to reclaim your psychic space if you have been abused or violated.