Since the mid 1970's, broccoli consumption has quadrupled, in good part due to its excellent nutritional value. Approximately 240 seeds / gram.
Hints:

Broccoli prefers cool moist conditions.

Start indoors, transplant 30 to 45 cm [12-18"] apart in rows 75 cm [30"] apart.

Rotate to a new location each year.

Broccoli - Green Sprouting Celebrese - 55 days. An early variety, very popular with market gardeners, canneries and freezers. Plants are deep green 45-50 cm [18-20"] tall. Heads early, close beaded, large. Side shoots develop for long season after cutting central head.