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I have been only been growing broccoli from seed for about a year but this technique works well for the novice.
First, start your seeds in a soil box with your own compost and worm castings, water each morning, and keep indoors until the seeds have sprouted. Plant 50 seeds or more to be sure you will have some great genetic uniqueness. Then take the box outside and be sure there is plenty of morning sun so the broccoli has energy to grow. After the sprouts have taken off a few inches they are ready to be transplanted into gallon containers.
Second, transplant the 2" broccoli sprouts into the gallon containers, be gentile not to disrupt the roots and try doing it in the dark or late afternoon so the plant has time to recover before the next day's full sun. You can grow the broccoli to maturity in these gallon containers but if you want sustainable giant broccoli that you can harvest every day I suggest waiting until these plants are around 6" and then transplant into large raised beds that are 12" or taller.
Third, transplant into raised beds, water each morning, and keep adding your own organic compost as fertilizer for the broccoli. Keep the cauliflower larva (green looking worms) off the plant by picking them off daily and keeping the white moths at bay.