brassica-oleracea broccoflower broccoli-cauliflower-cross cauliflower cauliflower-cultivar cross-pollination cruciferous cultivar edible flavor flavour food fresh green green-cauliflower green-headed inflorescence inflorescence-meristems mild nutritious plants raw sweet texture uncooked vegetable vegetables white-cauliflower brassica oleracea broccoli broccoli-cauliflower cross cauliflower cultivar curd color curd colour green cauliflower inflorescence meristems milder sweeter white cauliflower Astrantia flower garden head natural nature red summer display flowers geranium petals purple Abutilon flowerhead orange brown iris spring blue stems allium bulb onion plant