Want to regrow your hair? Use this single ingredient for the same How to apply castor oil Here is the way to apply castor oil packs to your hair for maximum benefit. Castor oil has a dense constancy, so mix it with coconut oil, olive oil or jojoba oil in an equal ratio to make it easier to dispense it evenly in your hair. Use fingers or a brush and start applying it onto your scalp with round gestures. This calm massage also intensifies the blood flow, revitalises the hair, and excites hair growth. Part hair into sections and apply the oil to each section till all of your hair is covered. Wrap your hair in a warm towel or shower cap and leave it for two to eight hours. For better results leave it overnight. This gives times to the oil to fully penetrate the follicles and hydrate your scalp and hair systematically. Wash your hair as normal using shampoo and conditioner. Make sure to rinse out all the oil out of your hair.