If you have the space in your grow-room to rotate them, then yes I think it helps in the long run to evenly disperse the light - both in veg and straight through to the end of flowering. It may become a bit more difficult to do once the start to really spread out and get top-heavy, but I usually use a bamboo-stick stake to support the tall colas in that case... Check out my latest grow for some pics to see..

Bagseed & Barney's Blue Cheese - Marijuana Growing
Dayzt1 Reviewed by Dayzt1 on . Should I rotate? I rotate/turn my plants every two days now that they have been in veg. Should i stop turning them when i start flowering? Rating: 5