I use 3-5 Gal pots with lots of holes in the bottoms. When I water. If I can get rain water I use that. If not I use filtered Reverse OZ water. BUT when I water, I water alot! I will give about 1/2 gallon to the plant and make sure the water flows out the bottom, then after 15 minutes I'll give em another quart or so. I water like this when 2 - 3 inches deep of the tops soil goes dry. Sometimes it turns out I am watering 2-3 days apart. Depends of the size of the plant, I let mine get 4-6 foot tall. Although I must say the 4 footers output is about the same as the 6 footers due to light restrictions. I know the planst don't like wet feet, so I have plenty of ventilation and have my plants at 75-80 degrees. In a 6 x 8 area I have 800 watt HPS. This tends to lower Humidity I wet the flooring of my planting area to increase Humidity at times when the leafs tell me they want it...grin One time I have a family of no see ems living in the grow. Didn't seem to bother the plants at all. They would play the game of how close can i get to the lights before I am toasted.