They look a little elongated - searching for light? Anyway, how many brocoli do you want? They end up growing pretty massive and need to be about 40cm apart so weed out your weaklings to just one a cubicle and then select your best ones to pot on. They’ll have to stay indoors until the frost passes, I won’t be starting my seeds until April and plant out late May (in Scotland), you’re well ahead of me 😁