Hair Growth Remedies

I was reading some question and i saw that lavendar oil helps with hair growth if you use it to massage your hair.
How many times do i have to massage it?
And how do i dilute it?

I have shoulder length hair and it has never been longer than that. I want long healthy hair, but not having to order a something online. I want to be able to go buy it in a store. My friend told me about a hair growth product from whole foods, but i dont know whether to buy it or not. ANY RECOMMENDATIONS?