Broccoli can be grown quite successfully in hydroponics systems. It’s well suited for media bed cultivation, and grows well in deep water systems (DWS). Be sure to space them well, & monitor nutrients.
Pop the broccoli seeds in the fridge while your medium is soaking. The brisk chill will let the seeds know its showtime!
Broccoli loves good bright light, but they do poorly when overheated. High efficiency lights like LED grow lights are perfect for broccoli. They generate less waste heat and will help your broccoli keep its cool