It depends if you are growing large transplants for a hot climate like Houston, Louisiana, So Cal, Florida, etc. If you are going to have 12" tall transplants in a gallon pot, you will want to fertilize with fish/seaweed emulsion at the 6" stage, otherwise the seedlings will "run out of gas".
Also, if you're in a cooler climate and weather turns bad, you might get delayed a week or two in planting and you don't want to transplant a "spent" plant.
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