first off, you dont want to clone in flowering because you will need to reveg the clones and stress your plants when they need to produce. you can apply some lst training and tie down the main stock of the NL to get it close to the same size.for when to flower, wait a week or two after you clone and your plants are out of shock. the healthier the plant is in flowering the more energy it can use to produce the sweet collie bud.