OP:
What kind of starting soil did you use? If you are 7 weeks in and they only have a set of true leaves, it sounds like their is a problem. Did you transplant them yet or are they still in the dense planted tray? Check the heat output on those tubes, you can probably get away with moving the tubes to about an inch above the plants.
Carolyn:
That's very interesting that you purposely seek out root bound plants. I always try to avoid this! So you don't trim the root bound roots when you plant out? Interesting...
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