Start indoors March/April or late April/May for summer harvest in 2 to 3 months. For fall harvest, start indoors late May/early June and transplant in July, harvesting in September/October. For overwintering sprouting broccoli, start indoors late March to mid-April, and harvest the following February to May. Seeds will germinate in 7-10 days. Optimal temperature for germination: 10-30°C (50-85°F).