Just a question for you experts out there. I planted my tomato seeds last week. Now they have sprouted & are up. How long under the grow light each day & how close should the grow light be to them initially? Thanks.
I would say at least 12 hours per day for duration. How close the lights are depends on what type of light you use. If it is fluorescent, the plants need to be very close - 5-15cm (2-6in). Try to give them real sunshine whenever you can.