I don't think they are rootbound, since I just transplanted them on Monday into 5 gal. pots for the flower. The nute feedings have been reeeaaal light. We are using the early growth recomendation from Flora Nova, it is about 450ppm according to the instructions on the container. We also have other plants of the same strain that are not taco-ing under the same feeding schedule. Overwatering could be possible, although I only tend to water when they feel and look dry... Oh and the plants are currently about 1 1/2 to 2 feet.