The term is also used more loosely to refer to thinnings and trimmed-off leaves of other types of Brassica, including turnip and swede leaves, surplus thinned out young cabbage plants and leaves from cauliflower and Brussels sprouts.
In all cases, the leaves, being loose, are fully exposed to light and atmospheric conditions, so are darker green, coarser, often tougher, and more strongly flavoured than cabbages that form a closed head, but are also particularly rich in vitaminC, folate and dietary fibre, making them a very healthy food.[citation needed]