I've never grown them Hydro but I have in dirt.
I'm in Brisbane which is pretty much warm through winter and hot in summer. I planted my first set in early spring and ended up with something that had more in comon with broccolini in that it was long tall and spread out. Temps 15c - 25c.
I tried again in the first week of winter when the temps would range between about 5c and 16c. Then I ended up with proper brocolli. 1 brocolli will produce enough for a couple of meals for a family of 4 in a meat and 3 veg type serving. If I had to guess I would say each plant produced about 500g of flower. I didn't try to get a second head out of them though and just cut them off and dug the plant in so can't comment on whether it would grow another. Harvest time was between 9 and 13 weeks.
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