even messaging your scalp with out oil is great! though adding a oil, or a mixture of oils can really be beneficial in aiding with the growth. a few things, first choose a light oil, if your going to use essential oils, only use a few drops.
Same base oils: argan oil, jojoba oil rosehip oil
same essential oils that can help in growth: rosemary, tea tree, peppermints.

Now ive made a mixture of rosemary, tea tree peppermints and argan oil, which i rubb into my scalp every night. i get same on the pads of my finger tips, rub them together then just message my scalp, i try to do it so i dont get it on my hair, cause i want the oil on my scalp. i just keep doing it till ive done my entire scalp, which takes about 5 mins. its part of my routine, so i dont forget.

ooh and hair grows quicker during the day, so i always message it at night, after my shower and before i go to bed.
hope that helps ladies!

my hair: 3b, high porosity, high density and coarse hair (i think i finally figured that all out)
my hair loves conditioner only styling!
Oils and my own procuts are my hairs best friend
my hair goal length is bra strap length when curly.