Flowering tomatoes:

Begin Flowering your Tomatoes

        
     Flowering is most likely one of the trickiest parts of how to grow tomatoes indoors. You will need to be familiar with how to force flowering in plants. Whatever you call it: blooming, flowering, flower forcing, or photo-period manipulation it is all the same thing. Some plants measure the dark periods and light periods of each day and change their growth patterns based on that information.

     A few tomatoes flower in 60 days and others take up to 80 days, beginning from the time you force flowering. Just as this process is begun, to make the final transplant into 3 gallon containers.

         
     For the first couple of weeks,  feed them heavy with a 10-52-70 or similar fertilizer. Each time they need water give them food also at 800 ppm. This would be a little over half of the recommended "full strength" on the directions. Keep in mind you are feeding them each time you water them. For the rest of the season, feed them 16-16-16 or similar at 800ppm.