It seems to me that the root system is tightly compacted into the pot so that it will be unable to absorb nutrients. The bigger pots. Tight pot, and too much watering can cause this.
It will grow for some time. While it is a bit longer, about a small system can't provide enough flow to the restaurant for you. It's like driving a truck in a car uphill, so that the cargo is growing all the time. At some point it stops and not be bothered anymore. You see it when the leaves...
If the lamp is too high in the plant can grow up to the ceiling. If the lamp, a powerful educational area is 1 square and 120 cm down. Should it be placed around the beginning of 70-80 cm above the plant. Excessive curl up the edges of the leaves of the artichokes a little if the lamp is too...
Who dares:) It is a problem. If someone is to stand up to this. Should know more. What to plant. What is System. Aero system roots dangling in the air, so the water will keep the work around all the time. I do not know whether the aquaculture in the pump turn off the dark for? I'm interested in.