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I have 4 broccoli plants growing in my raised bed and at this point all the central heads have been harvested. Now the side shoots are starting to grow. The side shoots will not get as big as the central head. Just keep on eye on them as they grow to make sure they do not flower, just as you would with the central head. I typically find that 4 side shoots begin to grow around where the central head was cut off. This takes place within about a week and it can take the shoots 1-2 weeks to mature, depending on the weather.