Grow like a pro with Calebrese Ironman F1. Commercial growers have replaced traditional Marathon with Ironman F1 and so should you! This top performing calabrese offers the longest cropping period from late May through to October, producing uniform blue-green domed heads. A quick-cropper ready to harvest in as little as 75 days after transplanting. Broccoli Ironman F1 shows good tolerance to hollow stem and resistance to bolting. Suitable for closer spacing for baby head production, or simply because growing space is tight. Height and spread 40cm (16").