cutting at the node, that may be where I went wrong with the few I tried. And I used soil not a bubbler haha. Great video man, did a great job showing and explaining how to do that. Something I recently learned from Dr Bruce Bugbee is instead of using perlite in the medium, for a little more vermiculite does a better job and adds silica to the medium for your plant to take in. thought it was neat. He does some pretty in depth testing on various cannabis growing scenarios.