GREEN SPROUTING BROCCOLI. An Italian heirloom brought to the US by immigrants in the 1880s, Calabrese Green Spouting broccoli plants grow 18-30 inches high and produce 3-6 inch blue-green central heads that are followed by prolific smaller side shoots. The best time to harvest your broccoli is when the heads appear tight and firm, before the tiny buds start to open. The appearance of yellow petals means you should pick your broccoli right away. Take a minimum of 6 inches of stem when removing broccoli from the garden. If side shoots have begun to grow, they will continue to do so. Calabrese Green Spouting broccoli plants will continue to grow new heads throughout the season, especially when planted in areas with cooler summers. Broccoli is packed with antioxidants and sulforaphane, believed to help prevent and fight cancer, improve bone health, promote healthier skin, and help with natural detoxification. 300+ seeds per order. Brassica oleracea. Annual. Cool season vegetable. Early spring / Fall. Soil temp 60F+. SOW- 3/4 seeds per, 1/4" deep, 18" apart. Keep moist. Germination 7 - 14 days. Thin to single best seedling. Use scissors to cut out unwanted sprouts. Medium water. Organic fertilizer if needed. Height 30" x 18" wide. About 60 Days for main head. Harvest side shoots through out growing season.