Quote Originally Posted by Rusty Trichome
Once she's old enough for alternating internodes, it's too late for topping.
I'm not sure I'd agree with this. My clones start out with alternating nodes because they come from a mother that was taken during late flower. I've had no trouble topping them and they seem to grow just like any other plant I've topped. Maybe that's just the strain I'm working with, though.