depending on the genetics, you could be witnessing hybrid vigor. Crossing two pure landrace strain(or just crossing indica's with sativa's) can sometimes create a hybrid that has traits from each strain. The resulting strain grows much faster and healthier because it combines all of the desirable traits from the parents.

Now i dont know if thats the case, or if the strain just veg's like a beast.
drudown11 Reviewed by drudown11 on . Oh Master you grow so fast ........ Ok how many peoples minds went into the gutter on that one?? Marty!!! The time has come to try something besides Medibud and we chose Master Kush. Put a seed in water 24 hours. Place seed in towel keep warm blah blah blah. 12 hours tap root pop, place in Rapid Rooter under 23w CFL. 28 hours later sprout pop. 11 hours later tap root 1/2 inch out the bottom of RR, transfer to 16oz cup filled with Tron and holes made in bottom for drainage. 10 hours later first true leaves visible. I'm not Rating: 5