best time to trim hair

i'm kinda confused here... what moon phase is the best to trim/cut hair to encourage growth? i hear some say a full moon and some say a new moon and then this site gives different days :
www.almanac.com/edpicks/astrological.html

Astrologer Susan Larsen, explains when to cut your hair for maximum benefits:

"If you choose to grow your hair long, cut hair during the first phase of the moon when the light is increasing. To further enhance the growth of your hair, cut it when the moon is in Cancer, Taurus, Scorpio, Capricorn, or Pisces. To increase thickness, cut during these times but also during the Leo moon. If you hate cutting your hair every 4-6 weeks, then choose the second phase of the moon when it is decreasing in light. Cutting when the moon is in a fire or air sign like Aries, Gemini, Leo, Libra, Sagittarius, and Aquarius, also prevents excessive growth."

The Long Hair Lovers web site has a nice article on this topic:

http://www.longhairlovers.com/moon_maintenance.html

I hope you find the answer to your question.