Calabrese Broccoli (Heirloom 55 Days )
The dark green plants are 18-30” in height and produce 3-6” central heads followed by an abundance of side shoots. The flavor of the Calabrese Broccoli is pronounced, a more basic taste than the more modern varieties.
Germination: 3-10 days
Germination Temperature: Optimum soil temperatures 65-85ºF.
Seed Sowing Depth: 1/4” deep
Starting Indoors: 4-6 weeks before the last frost. Sow 2-3 seeds per cell/pot. Thin to the strongest seedling. Fertilize the seedlings every 7-10 days with a liquid or water-soluble fertilizer, diluted to ¼ of the suggested measurement. Transplant a week or two before the last frost. Space 12-18" apart. Sow in early to mid-summer for fall crops.
Sowing Outdoors: Spring when the soil temperature reaches at least 55ºF. Sow 2-3 seeds every 12-18” apart. Thin to the strongest seedling per space. Sow in midsummer for fall crops. Germination is slower at lower soil temperatures.
Harvest: Pick when heads are tight before flower buds start to open. For varieties that produce side shoots keep picked for a longer production
Tips: Provide Calabrese Broccoli with fertile soil, rich in organic matter from the very beginning of its growth in the garden. Give adequate, even moisture for the best growth. Mulching helps retain moisture.