Seems that this is not a Green Cauliflower but Romanesco Broccoli. This is because it has striking and unusual fractal patterns of its flower head.Broccoli and cauliflower are closely related and fully cross compatible. The cross is easily made by hand pollination or natural pollinators. My hand pollination is not so good and neither is my natural pollination. So this one was bought at Garsons Farm for £2. The taste was very cauliflower like though apparently not identical.