I had a purple leaf curling stem problem last year for the first time in 40 years. It was also the first time I switched to a six bulb light set up. Nothing I tried helped, but the plants did survive. They went into the garden very purple and recovered quickly. I am convinced my problem was too much light, or the warmth from six bulbs just an inch above the plants.
The same problem began this year and I raised the light fixtures up to about 4" above the plants and they are doing much better.
TomNJ/VA
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