Are you sure they're not just rootbound or maybe have a nutrient lockup due to pH imbalance? Try flushing them thoroughly, a lot of times if you haven't flushed them in awhile, thats what they need, and will take off afterwards. As long as they look nice and green and healthy, they might just need more space for their roots. What size pots you got them in and how tall are they? A general rule is 1 gallon of pot size for every foot of height.
Splifted Reviewed by Splifted on . OregonsDank messes up :( Well around the 20th of October my plants were growing around 1/2 inch a day minimum and zero stretching. Near 14 inches tall on day 20 of growing. At this point my runt of the 6 passed all the others before I relised my plants were starving :(. I have always used maybe 20% or less of the recommended amount of food , since I mixed dry food in with soil when planted... Well my plants ate that all up real fast and now are starving. I guess I need to find an all purpose fertilizer to Rating: 5