I clone my bottom branches during veg I saw a guy on you tube top during sec week of flowering and I thought to myself why? but his video was good and so was his yeild....I'd never clone during flowering seems like it would stress the potential clones even more than they are going to be anyway.. but I have never tried so.. I like the bottom brances as the stem is thiner, younger seems like they root better, just my way not the best way and get some rooting gel you can clone without it in dirt but don't be upset if they die rooting horemone also protects rooting area from fungus and the stuff is cheep