Broccoli and cauliflower are different cultivars of the same species, and as such are fully cross compatible by hand pollination or natural pollinators.[1] There are two forms of Brassica oleracea that may be referred to as broccoflower, both of which are considered cultivars of cauliflower (Brassica oleracea var. botrytis) because they have inflorescentmeristems rather than flower buds when harvested.[2] One is shaped like regular cauliflower, the other has pointed, conical, spiraling clusters of florets. They share a curd color that is a similar hue to that of broccoli.
Green cauliflower
The first form of broccoflower has the physical attributes of a white cauliflower, but the curd color is lime-green. There are several cultivars of green cauliflower on the market, with the first release being 'Green Ball' with parentage of both broccoli and cauliflower.[3] The California firm Tanimura & Antle trademarked the word "Broccoflower" for the green cauliflower they market.[4]
The second form is Romanesco broccoli, which is characterised by the striking and unusual fractal patterns of its flower head. It has a yellow or vibrant green curd color.