I transplanted the plant into a 1-gallon pot. This was somewhat earlier than I wanted, but the plant had already started growing through the bottom of the cup. I prefer a denser root ball, but the plant is happy and healthy. I mixed Dr.Earth's 4-4-4 and 4-6-3 dry fertilizers, and worm castings in the Mother Earth Coco Peat that I used in my indoor grow. This filled out the rest of the 1-gallon pot to give the plant nutrient-dense soil to grow into. I moistened the soil and let it sit for most of the day. I then transplanted it right around an hour before the lights turned off to stress the plant as little as possible. It's since been doing great and showed almost no stress the next lights on.