Ways to make hair grow faster?

My hair is not long enough for a hairstyle that I REALLY want and I was hoping to get it cut before I go on a trip next month. I was hoping to make my hair one inch longer in a month or so (If that's possible) and I wanted some tips and/or treatments that I can make at home to help my hair grow. And I'm taking One A Day teen advantage for girls multivitamins. So don't suggest vitamins unless they might work better than what I'm already using! Thanks!