This week I transferred to 3 gallon smart pots. I purchased a 5lb bag of Super Soil Organic Concentrate from Nature's Living Soil. I am skeptical at this point because the directions say this is enough for an entire grow from start to finish. I followed the directions. I mixed 4lbs of this with a bag of Vermont Compost Fort Light, I think a 6 quart bag. I then filled the bottom third of each pot with that mixture. Then I filled the rest of each pot with Coast of Maine Bar Harbor Blend Organic Potting Soil, the purple bag. Crossed my fingers. Nothing but water from here on out.