I'm planning on growing in coco/perlite in my Autopots. The Autopot potting up guide states that with the 3.9 gallon pots the plants should be 9 inches before putting them into the Autopots. What do you start your plants in? Would starting them in a coco pot with coco/perlite in it and then just putting the whole pot into the Autopots work, or would that constrict the roots too much?