Here is a breakdown of Essential and Carrier Oils. Each essential oils has it's specific use:
Lavender is great for soothing the scalp and calming the hair.
Chamomile is the most soothing of the essential oils for the hair and scalp. Chamomile helps to retract skin cells that have been inflamed from chemical procedures, the sun and helps with those that have scaly scalps in including a lot of white flakes or psoriasis.
Lemon Essential oil works well for a treatment for dry scalp, dandruff, lice, and under active sebaceous glands. The sebum on the hair is what keeps it from dry out. Curly hair tends to be more dry and can benefit from lemon essential oils. Be very careful to only use lemon on hair that is too oily as this can seriously dry out the hair after just one washing or rinse.
Peppermint helps to stimulate blood flow to the root of the hair. This helps the hair to receive proper nourishment and to grow correctly. Peppermint makes the scalp tingle and this is what stimulates the blood flow to the hair.
Rosemary essential oil works great for dry hair and dandruff as well as itchy scalp.
Tea Tree essential oils works to purify the scalp. It works extremely good for those that suffer from scalp psoriasis and scalp dandruff.
Always remember that you cannot use these essential oils directly on your hair, but you should mixed with carrier oils first.
Carrier Oils for Hair
Olive Oil: This oil can be combined with other nice smelling essential oils. Olive oil is especially beneficial for dry hair suffering from indoor heating and sun. The hair is nourished and will regain its elasticity after a treatment with this oil.
Jojoba Oil: Jojoba oil is great for hair that is dry or damaged and it helps to moisturize and protect hair follicles against factors that cause hair loss.
Grape seed oil: massage the scalp with grape seed oil. It is believed that this oil stimulates hair growth.
Coconut oil: To have a beautiful, shiny hair and stimulate hair growth, give yourself a scalp massage with warm coconut oil once a week.
Castor oil: Castor oil stimulates blood circulation. More blood to the scalp, resulting in more nutrients and more hair growth. It is therefore very likely to be true what they say that with the castor oil hair grows faster and more plentiful.