How to use black castor oil to make hair longer?

I want my hair to grow and I research black castor oil but how do I use it?How to use black castor oil to make hair longer?
There is no evidence to date on whether or not Castor oil can improve hair growth. Having a good diet will increase hair growth.



But if you would like to incorporate castor oil in you hair regimen anyway you can use it to:



Seal your hair after moisturizing it.



As a pre-shampoo treatment, add it to deep conditioners, massage on your scalp, and as a sealer after moisturizing.



Lastly, you can use it as an oil rinse. (leave in the hair for a long period of time then rinse out.)