Ok thanks. I don't think that it is over watering. I have them in 3 gal felt pots and in a drainage table so that all the access water can drain out and be measured. Each plant got a gallon of water this moring and the overage was only about 3/4 of a gallon. So they were dry enough to soak of more than 80 percent of the water. The plants that are farther along seem to be starting to yellow out a bit. is that natural as they mature out?