We grow about 50 tomato plants every season in our GH. We've had great success planting the seeds in 3/4" soil blocks (using potting soil) that are placed on a capillary mat, watering the bottom mat and not directly on the soil blocks. Then we transplant them to 4" pots in 2-3 weeks until they are ready to be transferred to the GH in about 6 weeks, all under grow lights indoors. Here are a few photos:
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