I start the seeds (Broccoli, cabbage, cauliflower,) February 1, transplant late March early April. Major harvest in May, The Chinese cabbage will be first followed by common cabbage, cauliflower and broccoli. The broccoli will make side shoot after the main harvest extending their harvest into June. The others are one and done.
I also have salad radishes and pak choi in another location but they are direct seeded. I like brassicas.
I will repeat this September and add turnip, rutabaga, winter radishes, mustard