I have heard that too much borax can be very harmful to many crops. Most fertilizers contain trace amounts which are generally enough but a soil test could provide answers if you think your boron is inadequate.
I now plant my broccoli about 18 inches apart and usually get huge heads. I prefer not to deal with so many plants but then I only grow it for my family's consumption and do not freeze it. I'm usually sick of it by the time I'm harvesting side shots. Same with cauliflower.
Bill
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