Brassica oleraceae var. italica
Plant a group of 4 seeds every square foot. When 5 cm (2″) tall, thin to one per square.
Plant seeds 3 mm (⅛”) deep.
Best in full sun. pH around 6-6.8
Seeds will sprout in 7-14 days.
Leaf spot, downy mildew and black rot, as well as cabbage worms, cutworms and aphids.
Plant seeds 4 to 6 weeks before average last frost or as soon as soil can be worked, or start inside 4 to 6 weeks before average last frost.
Since broccoli has a very shallow root system, avoid digging the soil around the plants to weed. Water regularly (about 5 cm/2″ per week), but avoid watering the flower heads. Mulch to conserve soil moisture and reduce the soil temperature. Harvest when the main head gets to 7.6 cm (3″) in diameter, harvest the head. This will encourage large numbers of side florets.