How To Grow Hair Faster Using Castor Oil1. How to use: Castor oil has a consistent and gooey texture which can be difficult to apply if used alone. If you want to speed up the growth of your hair then mix the castor oil with one or two tablespoons of olive oil or coconut oil to create a pleasant consistency. Next, spread it on the roots of your hair and massage gently onto your scalp. Leave it on for between 6 and 12 hours. You can wrap your hair in a hot towel or in plastic wrap to speed up the effects and avoid staining your pillow, if you want to sleep with your mask. After this process, wash your hair as you usually would and repeat this daily for 4 weeks. But do not use it for more than 4 weeks because it will make the treatment less effective. However, you can restart this treatment process after three weeks.2. Alternative methods: To speed up hair growth, castor oil can be used alongside other natural ingredients. For example, castor oil is even more effective if used with nettle. This mixture creates a concentrate of toning vitamins and is fortifying for the hair. Try mixing a tablespoon of nettle hydrosol with a tablespoon of castor oil to create a very effective express care for hair loss. Apply to your roots and massage gently for 10 minutes then rinse with water. You can also replace the nettle hydrosol with almond oil and treat your hair with this once every 2 months. You should notice your hair regrowing faster after 2 or 3 months.