I agree, except with burying the stem to the first leaf. repotted mine around the stage you have shown here. Find five gallon pots if possible because weed plants love the space. Use an organic potting soil and do not add nutes (nutrients) for the first three weeks. Only water once weekly or twice if needed. Set tem three to four feet away from light and watch dem babies grow.
uh oh, actually I am with FDD on this one, not to say the other poster is wrong, there are many right ways. I always bury to the first leaves, it helps if a plant has stretched and your instance it save you some vertical room...