Green Sprouting Organic Broccoli Seeds 4025 Heirloom Vegetable. An old Italian variety that matures early and is surprisingly easy to grow. Large vigorous plants growing to approximately 50-60 cm (20-24â€³) in height are reliable producers of clusters of light blue-green heads. Delectable tasting heads are packed with vitamins and health boosting qualities. After harvesting the main head, numerous medium sized lateral heads will form for harvest later in the season.