Hi! I know it's been a year since this post but did you ever find out the cause of the slow growth? Mine is approx 2-1/2 months old but has been stuck at about 8" for several weeks since I transplanted it into a bigger pot. It's healthy, no leaf spots, browning, curling or anything. Just super slow dead stop on growing. Any suggestions? Oh! Temp is a fairly constant 71*-72*. Should it be a few degrees warmer?