I was just curious about this. I'm going out on a limb here and I'm going to say anytime after 2 weeks into flowering? I can you can take clones from a flowering plant. Harder to root them, but as long as its early on in flowering, I know its possible. My main concern lies with evening out my canopy. 3 tall plants, 3 short ones. The tall ones were topped once in veg, but during the flowering growth spurt, they've... gotten fairly large. I was thinking about topping the branches down a node. Is this advisable?