Grow like a pro with Calabrese 'Ironman' F1! Commercial growers have switched from traditional 'Marathon' to 'Ironman' F1, and so should you. This top-performing variety offers an extended cropping period from late May through October, producing uniform blue-green domed heads. A quick-cropper, it's ready to harvest just 75 days after transplanting. 'Ironman' F1 also shows good tolerance to hollow stem and resistance to bolting. Suitable for closer spacing for baby head production or for growing in tight spaces. Height and spread: 40cm (16"). Supplied as 1 x Packet of 30 seeds.